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  1. Article ; Online: Battery Longevity Comparison of Two Commonly Available Dual Channel Implantable Pulse Generators Used for Subthalamic Nucleus Stimulation in Parkinson's Disease.

    Fisher, Benjamin / Kausar, Jamilla / Garratt, Hayley / Hodson, James / White, Anwen / Ughratdar, Ismail / Mitchell, Rosalind

    Stereotactic and functional neurosurgery

    2018  Volume 96, Issue 3, Page(s) 151–156

    Abstract: Objectives: Deep brain stimulation for Parkinson's disease (PD) utilises an implantable pulse generator (IPG) whose finite lifespan in non-rechargeable systems necessitates their periodic replacement. We wish to determine if there is any significant ... ...

    Abstract Objectives: Deep brain stimulation for Parkinson's disease (PD) utilises an implantable pulse generator (IPG) whose finite lifespan in non-rechargeable systems necessitates their periodic replacement. We wish to determine if there is any significant difference in longevity of 2 commonly used IPG systems; the Medtronic Kinetra, and the Medtronic Activa Primary Cell (PC), which has come to replace it.
    Methods: All patients with bilateral Subthalamic Nucleus stimulators for PD performed in our centre were included. Battery life was then assessed using a Kaplan-Meier approach and comparisons between the Kinetra and Activa PC batteries were performed using log-rank tests.
    Results: Complete data was available for 183 patients. There was a significant difference in the average battery duration with an estimated median battery life in the Kinetra cohort of 6.6 years (95% CI 6.4-6.7), compared to 4.5 years (95% CI 4.4-4.5) in the Activa PC cohort (p < 0.001).
    Conclusion: The Activa PC IPG demonstrates a significantly reduced battery life of 2.1 years, with a median battery life of 4.5 years in comparison to 6.6 years in the Kinetra IPG. Future technology developments should therefore be focused on improving the battery life of the newer IPG systems.
    MeSH term(s) Aged ; Deep Brain Stimulation/instrumentation ; Electric Power Supplies ; Electrodes, Implanted ; Female ; Humans ; Longevity ; Male ; Middle Aged ; Parkinson Disease/therapy ; Subthalamic Nucleus/physiology
    Language English
    Publishing date 2018-06-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 645069-6
    ISSN 1423-0372 ; 1011-6125
    ISSN (online) 1423-0372
    ISSN 1011-6125
    DOI 10.1159/000488684
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  2. Article: Apathy in patients with Parkinson's disease following deep brain stimulation of the subthalamic nucleus.

    Hindle Fisher, Isabel / Pall, Hardev S / Mitchell, Rosalind D / Kausar, Jamilla / Cavanna, Andrea E

    CNS spectrums

    2016  Volume 21, Issue 3, Page(s) 258–264

    Abstract: Objective: Apathy has been reported as a possible adverse effect of deep brain stimulation of the subthalamic nucleus (STN-DBS). We investigated the prevalence and severity of apathy in 22 patients with Parkinson's disease (PD) who underwent STN-DBS, as ...

    Abstract Objective: Apathy has been reported as a possible adverse effect of deep brain stimulation of the subthalamic nucleus (STN-DBS). We investigated the prevalence and severity of apathy in 22 patients with Parkinson's disease (PD) who underwent STN-DBS, as well as the effects of apathy on quality of life (QOL).
    Methods: All patients were assessed with the Lille Apathy Rating Scale (LARS), the Apathy Scale (AS), and the Parkinson's Disease Questionnaire and were compared to a control group of 38 patients on pharmacotherapy alone.
    Results: There were no significant differences in the prevalence or severity of apathy between patients who had undergone STN-DBS and those on pharmacotherapy alone. Significant correlations were observed between poorer QOL and degree of apathy, as measured by the LARS (p<0.001) and the AS (p=0.021). PD-related disability also correlated with both apathy ratings (p<0.001 and p=0.017, respectively).
    Conclusion: Our findings suggest that STN-DBS is not necessarily associated with apathy in the PD population; however, more severe apathy appears to be associated with a higher level of disability due to PD and worse QOL, but no other clinico-demographic characteristics.
    MeSH term(s) Aged ; Antiparkinson Agents/therapeutic use ; Apathy ; Case-Control Studies ; Deep Brain Stimulation ; Female ; Humans ; Male ; Middle Aged ; Parkinson Disease/psychology ; Parkinson Disease/therapy ; Prevalence ; Quality of Life/psychology ; Risk Factors ; Severity of Illness Index ; Subthalamic Nucleus
    Chemical Substances Antiparkinson Agents
    Language English
    Publishing date 2016-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2008418-3
    ISSN 2165-6509 ; 1092-8529
    ISSN (online) 2165-6509
    ISSN 1092-8529
    DOI 10.1017/S1092852916000171
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  3. Article: Battery Longevity Comparison of Two Commonly Available Dual Channel Implantable Pulse Generators Used for Subthalamic Nucleus Stimulation in Parkinson’s Disease

    Fisher, Benjamin / Kausar, Jamilla / Garratt, Hayley / Hodson, James / White, Anwen / Ughratdar, Ismail / Mitchell, Rosalind

    Stereotactic and Functional Neurosurgery

    2018  Volume 96, Issue 3, Page(s) 151–156

    Abstract: Objectives: Deep brain stimulation for Parkinson’s disease (PD) utilises an implantable pulse generator (IPG) whose finite lifespan in non-rechargeable systems necessitates their periodic replacement. We wish to determine if there is any significant ... ...

    Institution Department of Neurosurgery, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
    Institute of Translational Medicine, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
    Abstract Objectives: Deep brain stimulation for Parkinson’s disease (PD) utilises an implantable pulse generator (IPG) whose finite lifespan in non-rechargeable systems necessitates their periodic replacement. We wish to determine if there is any significant difference in longevity of 2 commonly used IPG systems; the Medtronic Kinetra, and the Medtronic Activa Primary Cell (PC), which has come to replace it. Methods: All patients with bilateral Subthalamic Nucleus stimulators for PD performed in our centre were included. Battery life was then assessed using a Kaplan-Meier approach and comparisons between the Kinetra and Activa PC batteries were performed using log-rank tests. Results: Complete data was available for 183 patients. There was a significant difference in the average battery duration with an estimated median battery life in the Kinetra cohort of 6.6 years (95% CI 6.4–6.7), compared to 4.5 years (95% CI 4.4–4.5) in the Activa PC cohort (p < 0.001). Conclusion: The Activa PC IPG demonstrates a significantly reduced battery life of 2.1 years, with a median battery life of 4.5 years in comparison to 6.6 years in the Kinetra IPG. Future technology developments should therefore be focused on improving the battery life of the newer IPG systems.
    Keywords Deep brain stimulator ; Internal pulse generator ; Subthalamic nucleus ; Parkinson’s disease ; Kinetra ; Activa PC ; Battery
    Language English
    Publishing date 2018-06-19
    Publisher S. Karger AG
    Publishing place Basel, Switzerland
    Document type Article
    Note Clinical Study
    ZDB-ID 645069-6
    ISSN 1423-0372 ; 1011-6125
    ISSN (online) 1423-0372
    ISSN 1011-6125
    DOI 10.1159/000488684
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  4. Article ; Online: Deep brain stimulation improves survival in severe Parkinson's disease.

    Ngoga, Desire / Mitchell, Rosalind / Kausar, Jamilla / Hodson, James / Harries, Anwen / Pall, Hardev

    Journal of neurology, neurosurgery, and psychiatry

    2014  Volume 85, Issue 1, Page(s) 17–22

    Abstract: Objectives: Levodopa and other dopaminergic treatments have not had the expected effect on survival in Parkinson's disease (PD). Bilateral subthalamic nucleus deep brain stimulation (STN-DBS) has been shown to improve motor function, motor fluctuations, ...

    Abstract Objectives: Levodopa and other dopaminergic treatments have not had the expected effect on survival in Parkinson's disease (PD). Bilateral subthalamic nucleus deep brain stimulation (STN-DBS) has been shown to improve motor function, motor fluctuations, health-related quality of life, and to reduce medication usage and drug-induced dyskinesia in patients with severe PD refractory to medical therapy. Little however, has been described on the impact of STN-DBS on the survival of these patients. We aim in this study to examine the impact of STN-DBS on the survival of patients with severe PD.
    Methods: Patients who were eligible for STN-DBS were given the choice of undergoing surgery or continuing on medical treatment. Those who exercised patient choice and preferred to continue with medical treatment formed a control population. All eligible patients seen in a 10-year period are included in this study. Our primary outcome measure is a difference in mortality between the two groups with a secondary measure of admission rates to residential (nursing home) care.
    Results: 106 patients underwent STN-DBS, and 41 patients exercised patient choice and declined the procedure. The two groups were matched for age, gender, ethnicity, duration of disease, rates of pre-existing depression and Levodopa equivalent doses of anti-Parkinson's medications taken. Patients undergoing STN-DBS had significantly longer survival and were significantly less likely to be admitted to a residential care home than those managed purely medically. The statistical significance of these findings persisted after adjusting for potential confounding factors (survival: p=0.002, HR 0.29 (0.13 to 0.64) (residential care home admission: OR: 0.1 (95% CI 0.0 to 0.3; p<0.001).
    Interpretation: We show for the first time that there is a survival advantage of DBS surgery in advanced PD. The effect of potential bias factors is examined. The survival advantage may arise for several postulated reasons, ranging from improvement in axial functions, such as swallowing, to some as yet unrecognised benefit of reduction in dopaminergic medication. These findings are of great interest to both patients with PD and the health professionals considering the treatment options for patients with severe PD.
    MeSH term(s) Aged ; Antiparkinson Agents/therapeutic use ; Cause of Death ; Deep Brain Stimulation/methods ; Depression/etiology ; Depression/psychology ; Female ; Humans ; Kaplan-Meier Estimate ; Levodopa/therapeutic use ; Logistic Models ; Male ; Middle Aged ; Neuropsychological Tests ; Parkinson Disease/mortality ; Parkinson Disease/psychology ; Parkinson Disease/therapy ; Psychiatric Status Rating Scales ; Regression Analysis ; Subthalamic Nucleus/physiology ; Survival ; Survival Analysis ; Treatment Outcome
    Chemical Substances Antiparkinson Agents ; Levodopa (46627O600J)
    Language English
    Publishing date 2014-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3087-9
    ISSN 1468-330X ; 0022-3050
    ISSN (online) 1468-330X
    ISSN 0022-3050
    DOI 10.1136/jnnp-2012-304715
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: The effect of dopaminergic therapy on intraoperative microelectrode recordings for subthalamic deep brain stimulation under GA: can we operate on patients 'on medications'?

    Asha, Mohammed J / Kausar, Jamilla / Krovvidi, Hari / Shirley, Colin / White, Anwen / Chelvarajah, Ramesh / Hodson, James A / Pall, Hardev / Mitchell, Rosalind D

    Acta neurochirurgica

    2016  Volume 158, Issue 2, Page(s) 387–393

    Abstract: Objectives: Microelectrode recording (MER) plays an important role in target refinement in deep brain stimulation (DBS) of the subthalamic nucleus (STN) for Parkinson's disease (PD). Traditionally, patients were operated on in the 'off-medication' state ...

    Abstract Objectives: Microelectrode recording (MER) plays an important role in target refinement in deep brain stimulation (DBS) of the subthalamic nucleus (STN) for Parkinson's disease (PD). Traditionally, patients were operated on in the 'off-medication' state to allow intraoperative assessment of the patient response to direct STN stimulation. The development of intraoperative microelectrode recording (MER) has facilitated the introduction of general anaesthesia (GA). However, the routine withdrawal of dopaminergic medications has remained as standard practice. This retrospective review examines the effect of continuing these medications on intraoperative MER for subthalamic DBS insertion under GA and discusses the clinical implication of this approach.
    Methods: Retrospective review of PD patients who had bilateral STN DBS insertion was conducted. A cohort of seven patients (14 STN microelectrodes) between 2012 and 2013, who inadvertently underwent the procedure while 'on medication', was identified. This 'on-medication' group was compared to all other patients who underwent the same procedure between 2012 and 2013 and had their medications withdrawn preoperatively, the 'off-medication' group, n = 26 (52 STN DBS). The primary endpoint was defined as the number of microelectrode tracks required to obtain adequate STN recordings. A second endpoint was the length of MERs that was finally used to guide the DBS lead insertion. The Reduction of the levo-dopa equivalent daily dose (LEDD) was also examined as a surrogate marker for clinical outcome 12 months postoperatively for both groups. For the on-medication group further analysis of the clinical outcome was done relying on the change in the motor examination at 12 months following STN DBS using the following parameters (Hoehn and Yahr scale, the number of waking hours spent in the OFF state as well as the duration of dyskinesia during the ON periods).
    Results: The on-medication group was statistically comparable in all baseline characteristics to the off-medication group, including age at operation 57 ± 9.9 years vs. 61.5 ± 9.2 years, p = 0.34 (mean ± SD); duration of disease (11.6 ± 5 years vs. 11.3 ± 4 years, p = 0.68); gender F:M ratio (1:6 vs. 9:17, p = 0.40). Both groups had similar PD medication regimes preoperatively expressed as levodopa equivalent daily dose (LEDD) 916 mg (558-1850) vs. 744 mg (525-3591), respectively, p = 0.77. In the on-medication group, all seven patients (14 STN electrodes) had satisfactory STN recording from a single brain track versus 15 out of 26 patients (57.7 %) in the off-medication group, p = 0.06. The length of MER was 4.5 mm (3.0-5.5) in the on-medication group compared to 3.5 mm (3.0-4.5) in the off-medication group, p = 0.16. The percentage of reduction in LEDD postoperatively for the on-medication group was comparable to that in the off-medication group, 62 % versus 58 %, respectively, p > 0.05. All patients in the on-medication group had clinically significant improvement in their PD motor symptoms as assessed by the Hoehn and Yahr scale; the number of hours (of the waking day) spent in the OFF state dropped from 6.9 (±2.3) h to 0.9 (±1.6) h; the duration of dyskinesia during the ON state dropped from 64 % (±13 %) of the ON period to only 7 % (±12 %) at 12 months following STN DBS insertion.
    Conclusion: STN DBS insertion under GA can be performed without the need to withdraw dompaminergic treatment preoperatively. In this review the inadvertent continuation of medications did not affect the physiological localisation of the STN or the clinical effectiveness of the procedure. The continuation of dopamine therapy is likely to improve the perioperative experience for PD patients, avoid dopamine-withdrawal complications and improve recovery. A prospective study is needed to verify the results of this review.
    MeSH term(s) Aged ; Anesthesia, General ; Antiparkinson Agents/pharmacology ; Contraindications ; Deep Brain Stimulation ; Female ; Humans ; Levodopa/pharmacology ; Male ; Middle Aged ; Subthalamic Nucleus/drug effects
    Chemical Substances Antiparkinson Agents ; Levodopa (46627O600J)
    Language English
    Publishing date 2016-02
    Publishing country Austria
    Document type Journal Article
    ZDB-ID 80010-7
    ISSN 0942-0940 ; 0001-6268
    ISSN (online) 0942-0940
    ISSN 0001-6268
    DOI 10.1007/s00701-015-2631-1
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  6. Article ; Online: Subthalamic nucleus microelectrode recordings (MER) can be reliably detected despite general anaesthesia and dopaminergic treatment.

    Asha, Mohammed / Kausar, Jamilla / Krovvidi, Hari / Shirely, Colin / White, Anwen / Chelvarajah, Ramesh / Pall, Hardev / Mitchell, Rosalind

    Acta neurochirurgica

    2016  Volume 158, Issue 5, Page(s) 1015–1016

    MeSH term(s) Anesthesia, General ; Deep Brain Stimulation ; Humans ; Microelectrodes ; Parkinson Disease/surgery ; Subthalamic Nucleus
    Language English
    Publishing date 2016-03-04
    Publishing country Austria
    Document type Letter ; Comment
    ZDB-ID 80010-7
    ISSN 0942-0940 ; 0001-6268
    ISSN (online) 0942-0940
    ISSN 0001-6268
    DOI 10.1007/s00701-016-2758-8
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  7. Article ; Online: Subthalamic deep brain stimulation under general anesthesia and neurophysiological guidance while on dopaminergic medication: comparative cohort study.

    Asha, Mohammed Jamil / Fisher, Benjamin / Kausar, Jamilla / Garratt, Hayley / Krovvidi, Hari / Shirley, Colin / White, Anwen / Chelvarajah, Ramesh / Ughratdar, Ismail / Hodson, James A / Pall, Hardev / Mitchell, Rosalind D

    Acta neurochirurgica

    2018  Volume 160, Issue 4, Page(s) 823–829

    Abstract: Objectives: The authors have previously reported on the technical feasibility of subthalamic nucleus deep brain stimulation (STN DBS) under general anesthesia (GA) with microelectrode recording (MER) guidance in Parkinsonian patients who continued ... ...

    Abstract Objectives: The authors have previously reported on the technical feasibility of subthalamic nucleus deep brain stimulation (STN DBS) under general anesthesia (GA) with microelectrode recording (MER) guidance in Parkinsonian patients who continued dopaminergic therapy until surgery. This paper presents the results of a prospective cohort analysis to verify the outcome of the initial study, and report on wider aspects of clinical outcome and postoperative recovery.
    Methods: All patients in the study group continued dopaminergic therapy until GA was administered. Baseline characteristics, intraoperative neurophysiological markers, and perioperative complications were recorded. Long-term outcome was assessed using selective aspects of the unified Parkinson's disease rating scale motor score. Immediate postoperative recovery from GA was assessed using the "time needed for extubation" and "total time of recovery." Data for the "study group" was collected prospectively. Examined variables were compared between the "study group" and "historical control group" who stopped dopaminergic therapy preoperatively.
    Results: The study group, n = 30 (May 2014-Jan 2016), were slightly younger than the "control group," 60 (51-64) vs. 64 (56-69) years respectively, p = 0.043. Both groups were comparable for the recorded intraoperative neurophysiological parameters; "number of MER tracks": 60% of the "study group" had single track vs. 58% in the "control" group, p = 1.0. Length of STN MER detected was 9 vs. 7 mm (median) respectively, p = 0.037. A trend towards better recovery from GA in the study group was noted, with shorter "total recovery time": 60 (50-84) vs. 89 (62-120) min, p = 0.09. Long-term improvement in motor scores and reduction in L-dopa daily equivalent dose were equally comparable between both groups. No cases of dopamine withdrawal or problems with immediate postop dyskinesia were recorded in the "on medications group." The observed rate of dopamine-withdrawal side effects in the "off-medications" group was 15%.
    Conclusions: The continuation of dopaminergic treatment for patients with PD does not affect the feasibility/outcome of the STN DBS surgery. This strategy appears to reduce the risk of dopamine-withdrawal adverse effects and may improve the recovery in the immediate postoperative period, which would help enhance patients' perioperative experience.
    MeSH term(s) Aged ; Anesthesia, General/adverse effects ; Anesthesia, General/methods ; Cohort Studies ; Deep Brain Stimulation/adverse effects ; Deep Brain Stimulation/methods ; Dopamine Agents/therapeutic use ; Female ; Humans ; Levodopa/therapeutic use ; Male ; Microelectrodes ; Middle Aged ; Parkinson Disease/therapy ; Postoperative Complications/epidemiology ; Prospective Studies ; Subthalamic Nucleus/physiopathology
    Chemical Substances Dopamine Agents ; Levodopa (46627O600J)
    Language English
    Publishing date 2018-02-02
    Publishing country Austria
    Document type Comparative Study ; Journal Article
    ZDB-ID 80010-7
    ISSN 0942-0940 ; 0001-6268
    ISSN (online) 0942-0940
    ISSN 0001-6268
    DOI 10.1007/s00701-018-3473-4
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  8. Article ; Online: Deep brain stimulation of the subthalamic nucleus for advanced Parkinson disease using general anesthesia: long-term results.

    Harries, Anwen M / Kausar, Jamilla / Roberts, Stuart A G / Mocroft, A Paul / Hodson, James A / Pall, Hardev S / Mitchell, Rosalind D

    Journal of neurosurgery

    2012  Volume 116, Issue 1, Page(s) 107–113

    Abstract: Object: The authors analyze long-term outcome in a substantial number of patients who underwent subthalamic nucleus (STN) deep brain stimulation (DBS) surgery under general anesthesia.: Methods: Eighty-two patients underwent bilateral placement of ... ...

    Abstract Object: The authors analyze long-term outcome in a substantial number of patients who underwent subthalamic nucleus (STN) deep brain stimulation (DBS) surgery under general anesthesia.
    Methods: Eighty-two patients underwent bilateral placement of DBS electrodes under general anesthesia for advanced Parkinson disease; the STN was the target in all cases. All patients underwent intraoperative microelectrode recording of the STN. No intraoperative macrostimulation was performed. Unified Parkinson's Disease Rating Scale (UPDRS) data were recorded in 28 patients. Assessment of outcome was performed using the UPDRS (in 28 cases), the electrophysiological recordings (in all 82 cases), medication reduction (in 78 cases), and complications (in 82 cases).
    Results: There was improvement in UPDRS scores across all measures following surgery. The total UPDRS score, off medication, improved from 68.78 (geometrical mean, 95% CI 61.76-76.60) preoperatively to 45.89 (geometrical mean, 95% CI 34.86-60.41) at 1 year postoperatively (p = 0.003, data available in 26 patients). Improvements were obtained in UPDRS Part II (Activities of Daily Living) off medication (p = 0.001) and also UPDRS Part III (Motor Examination) off medication (p < 0.001). Results for the on-medication and on-stimulation states also showed a statistically significant improvement for UPDRS Part III (p = 0.047). Good microelectrode recording of the STN was obtained under general anesthesia; the median first-track length was 4.0 mm, and the median number of tracks passed per patient was 3.0. The median reduction in levodopa medication was 58.1% (interquartile range 42.9%-73.3%). One patient had an intracerebral hemorrhage in the track of 1 electrode but did not require surgical evacuation. One patient had generalized convulsive seizures 24 hours postoperatively and was intubated for seizure control. Unified Parkinson's Disease Rating Scale scores were obtained in 26 patients at 1 year, 28 patients at 3 years, 17 at 5 years, and 7 at 7 years postoperatively. Up to 7 years postoperatively, there was sustained improvement in the total UPDRS score. The results in these patients showed minimal deterioration in the motor section of the UPDRS over time, up to 7 years following the operation. The authors found no evidence that the UPDRS Part II scores changed significantly over the period of 1-7 years after surgery (p = 0.671, comparison of mean scores at 1 and 7 years using generalized estimating equations).
    Conclusions: Long-term outcomes confirm that it is both safe and effective to perform STN DBS under general anesthesia. As part of patient choice, this option should be offered to all DBS candidates with advanced Parkinson disease to enable more of these patients to undergo this beneficial surgery.
    MeSH term(s) Aged ; Anesthesia, General ; Deep Brain Stimulation/methods ; Female ; Humans ; Male ; Middle Aged ; Parkinson Disease/physiopathology ; Parkinson Disease/therapy ; Subthalamic Nucleus/physiopathology ; Treatment Outcome
    Language English
    Publishing date 2012-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3089-2
    ISSN 1933-0693 ; 0022-3085
    ISSN (online) 1933-0693
    ISSN 0022-3085
    DOI 10.3171/2011.7.JNS11319
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    ab Jg. 2022: Lesesaal (EG)

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