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. 2015 Oct 12;3(2):109–115. doi: 10.1002/mdc3.12235

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© 2015 The Authors. Movement Disorders Clinical Practice published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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PRISMA flow diagram reporting the results of the systematic literature search. Level 1 screening = review of titles and abstracts; Level 2 screening = review of full‐text articles; PRISMA = Preferred Reporting Items for Systematic Reviews and Meta‐Analyses.