1. Department of Clinical Neurological Sciences; Schulich School of Medicine and Dentistry; University of Western Ontario; London; Ontario; Canada
2. Department of Education Development and Research; Maastricht University; Maastricht; the Netherlands
3. Centre for Health Economics and Policy Analysis; McMaster University; Hamilton; Ontario; Canada
4. Department of Medicine; Schulich School of Medicine and Dentistry; University of Western Ontario; London; Ontario; Canada