1. McGill University, Department of Family Medicine, 515 Pine Avenue West, Montreal, Quebec H2W 1S4, Canada,
2. McGill University, Department of Family Medicine, 515 Pine Avenue West, Montreal, Quebec H2W 1S4, Canada
3. University of Southern Australia - School of Public Health, Adelaide, South Australia, Australia
4. Centre for Health Sciences, Barts, and The London School of Medicine and Dentistry, United Kingdom
5. University of California at San Francisco - Department of Epidemiology and Biostatistics, San Francisco, California, USA
6. University of Western Ontario - Dept of Family Medicine, Schulich School of Medicine and Dentistry, London, Ontario, Canada