[1] Radboud Univ Nijmegen, Donders Inst Brain Cognit & Behav, Ctr Expertise Parkinson & Movement Disorders, Dept Neurol,Med Ctr, Nijmegen, Netherlands
[2] Royal United Hosp Bath NHS Fdn Trust, Older Peoples Unit, Bath, Avon, England
[3] Univ Bristol, Bristol Med Sch, Dept Populat Hlth Sci, Bristol, Avon, England
[4] Univ Rochester, Med Ctr, Dept Neurol, Ctr Hlth & Technol, Rochester, NY 14642 USA
[5] Univ Florida, Dept Neurol, Norman Fixel Inst Neurol Dis, Gainesville, FL USA
[6] Univ Lagos, Dept Med, Coll Med, Neurol Unit, Lagos, Nigeria
[7] Capital Med Univ, Xuanwu Hosp, Natl Clin Res Ctr Geriatr Disorders, Dept Neurobiol Neurol & Geriatr, Beijing, Peoples R China
[8] CUNY Queens Coll, Flushing, NY 11367 USA