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Footnotes
Handling editor Tahir S Pillay.
Contributors GL and FS: substantial contributions to the conception or design of the work or the acquisition, analysis or interpretation of data. CT, MM, ED, GLS: drafting the work and/or revising it critically for important intellectual content. CT, GLS: data collection. GL: statistical analysis. All coauthors give final approval of the version submitted and/or published. All authors showed agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Competing interests None declared.
Patient consent Obtained.
Ethics approval University of Verona, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy; protocol number 165038, 28 June 2016.
Provenance and peer review Not commissioned; externally peer reviewed.