1 Division of Neurology, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC V6T 2B5, Canada. Electronic address: silke.cresswell@ubc.ca.
2 Faculty of Dentistry, Université de Montréal, Montréal, QC, Canada; Centre Hospitalier de L'Université de Montréal, Montréal, QC, Canada.
3 Parkinson Canada, Toronto, ON, Canada.
4 Department of Neurology, Montréal General Hospital, Montréal, QC, Canada.