- Received January 9, 2014.
- Accepted March 23, 2014.
- Published online May 14, 2014.
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- 1Center for Clinical Epidemiology, Lady Davis Institute, Jewish General Hospital, Montreal, Canada
- 2Departments of Epidemiology and Biostatistics and of Medicine, McGill University, Montreal, Canada
- 3Dept of Plastic Surgery, Université de Montréal, Montreal, Quebec, Canada
- Samy Suissa, Centre for Clinical Epidemiology, Jewish General Hospital, 3755 Cote Ste-Catherine, Montreal, Québec, H3T 1E2, Canada. E-mail,