1 Department of Neurology, Centro Hospitalar Universitário São João, EPE, Porto, Portugal.
2 Department of Clinic Neurosciences and Mental Health, Faculty of Medicine of University of Porto, Porto, Portugal.
3 Department of Neurology, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal.
4 Department of Neurology, Hospital Central do Funchal, Funchal, Portugal.
5 Edmond J Safra Program in Parkinson Disease, Movement Disorder Clinic, Toronto Western Hospital, and the University of Toronto Department of Medicine, Toronto, Ontario, Canada.