Marjan Attaei1, Salim Yusuf2. 1. Department of Health Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada. 2. Population Health Research Institute, Hamilton Health Sciences, McMaster University, Hamilton, ON L8S 4L8, Canada; Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON L8S 4L8, Canada; Department of Medicine, McMaster University, Hamilton, ON L8S 4L8, Canada. Electronic address: yusufs@mcmaster.ca.