Samy Suissa1,2, Pierre Ernst3,2. 1. Center for Clinical Epidemiology, Lady Davis Institute - Jewish General Hospital, Montreal, QC, Canada samy.suissa@mcgill.ca. 2. Dept of Epidemiology and Biostatistics and Dept of Medicine, McGill University, Montreal, QC, Canada. 3. Center for Clinical Epidemiology, Lady Davis Institute - Jewish General Hospital, Montreal, QC, Canada.