1. Department of Medicine (Neurology); Pacific Parkinson's Research Centre, University of British Columbia; Vancouver British Columbia Canada
2. Department of Medical Genetics; Centre for Applied Neurogenetics, University of British Columbia; Vancouver British Columbia Canada
3. Department of Neurology; St. Olav's Hospital; Trondheim Norway
4. Division of Neurology; University of Saskatchewan and Saskatoon Health Region; Saskatoon Saskatchewan Canada