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JKW has nothing to report. LA works as a consultant and participates in advisory boards for Boston Scientific and Medtronic, and has received honoraria for these services. LA has no conflicts of interest pertaining the scope of this manuscript to be declared. CWH has served as a site investigator or co-investigator for research projects funded by the Parkinson\u2019s Foundation and has served as a research committee member for the Michael J. Fox Foundation. CWH has served as a speaker for the National Parkinson Foundation, the Parkinson\u2019s Disease Foundation, and the Davis Phinney Foundation. CWH has participated in CME and educational activities on movement disorders sponsored by Allergan, Ipsen, Mertz Pharmaceuticals, Peerview Online, UptoDate, and QuantiaMD. AWS reports grants from the NIH and has received grant support from Benign Essential Blepharospasm Research foundation, Dystonia coalition, Dystonia Medical Research foundation, National Organization for Rare Disorders and grant support from NIH (KL2 and K23 NS092957-01A1). KDF reports grants from NIH, and other funding from Donnellan\/Einstein\/Merz Chair, during this study; grants and non-financial support from Medtronic, grants from St Jude, Functional Neuromodulation, and Boston Scientific, and grants and other funding from Neuropace. Additionally, KDF has a patent US 8295935 B2 issued for a DBS cranial lead fixation device. MSO serves as consultant for the National Parkinson\u2019s Foundation, and has received research grants from the National Institutes of Health, National Parkinson\u2019s Foundation, Michael J. Fox Foundation, Parkinson Alliance, Smallwood Foundation, Bachmann-Strauss Foundation, Tourette Syndrome Association, and UF Foundation. MSO has previously received honoraria, but in the past\u2009>\u200960\u00a0months has received no support from industry. MSO has received royalties for publications with Demos, Manson, Amazon, Smashwords, Books4Patients, and Cambridge (movement disorders books). MSO is an associate editor for New England Journal of Medicine Journal Watch Neurology. MSO has participated in CME and educational activities on movement disorders (in the last 36\u00a0months) sponsored by PeerView, Prime, Quantia, Henry Stewart, and the Vanderbilt University. The institution and not MSO receives grants from Medtronic, Abbvie, and ANS\/St. Jude, and the PI has no financial interest in these grants. MSO has participated as a site PI and\/or co-I for several NIH, foundation, and industry sponsored trials over the years but has not received honoraria. AWS reports grants from the NIH and has received grant support from Benign Essential Blepharospasm Research foundation, Dystonia coalition, Dystonia Medical Research foundation, National Organization for Rare Disorders and grant support from NIH (KL2 and K23 NS092957-01A1). ARZ acknowledges research grants from the Parkinson\u2019s Foundation and has received consulting honoraria from Medtronic, Boston Scientific, Bracket, Stealth, Rho Inc in the past 24\u00a0months.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflicts of interest"}},{"value":"This pooled meta-analysis used only the published data.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical standards"}}]}}