The effect of deep brain stimulation on the non-motor symptoms of Parkinson’s disease: a critical review of the current evidence

M.M.K. performed the bibliographical search and wrote the final draft of the manuscript and tables. T.R. wrote the first draft of the sleep, pain, and dysautonomia sections and tables and contributed to the bibliographic search. L.F.D. wrote the first draft of the cognitive, neuropsychiatric, and weight sections and tables. H.S.D. reviewed the final draft and contributed to the bibliographic search