1 Divisions of General Internal Medicine and Clinical Epidemiology, McGill University Health Centre, Montreal, Quebec, Canada; Center for Outcomes Research and Evaluation, Research Institute, McGill University Health Centre, Montreal, Quebec, Canada. Electronic address: [email protected].
2 Center for Outcomes Research and Evaluation, Research Institute, McGill University Health Centre, Montreal, Quebec, Canada; Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy.