[1] Univ Alberta, Dept Med, Div Neurol, Parkinson & Movement Disorders Program, Edmonton, AB, Canada
[2] Univ Malaya, Fac Med, Dept Med, Div Neurol, Kuala Lumpur, Malaysia
[3] Univ Malaya, Fac Med, Mah Pooi Soo & Tan Chin Nam Ctr Parkinsons & Rela, Kuala Lumpur, Malaysia
[4] Kings Coll Hosp London, Parkinson Fdn Int Ctr Excellence, Denmark Hill Campus, London, England
[5] Kings Coll London, Denmark Hill Campus, London, England
[6] Univ Padua, Movement Disorders Unit, Dept Neurosci, Ctr Rare Neurol Dis, Padua, Italy
[7] Univ Sao Paulo, Phys Therapy Speech Therapy & Occupat Therapy Dep, Med Sch, Sao Paulo, Brazil
[8] North Bristol NHS Trust, Bristol, Avon, England
[9] Univ Santiago Chile, Fac Ciencias Med, Ctr Trastornos Movimiento, Santiago, Chile
[10] Paracelsus Med Univ, Inst Nursing Sci & Practice, Salzburg, Austria
[11] Ludwig Maximillians Univ, Munich, Germany
[12] Kliniku Agatharied, Dept Neurol, Hausham, Germany
[13] Northumbria Healthcare NHS Fdn Trust, Newcastle Upon Tyne, Tyne & Wear, England
[14] Chulalongkorn Univ, Fac Med, Chulalongkorn Ctr Excellence Parkinsons Dis & Rel, Dept Med, Bangkok, Thailand
[15] King Chulalongkorn Mem Hosp, Thai Red Cross Soc, Bangkok, Thailand
[16] Royal Soc Thailand, Acad Sci, Bangkok, Thailand
[17] Inst Med Mol Joao Lobo Antunes, Lisbon, Portugal
[18] Parkinson Victoria, Surry Hills, Vic, Australia