1. Division of Infectious Diseases, Department of Medicine, McGill University Health Centre , Montréal, Québec, Canada
2. Division of Medical Microbiology, Department of Laboratory Medicine, McGill University Health Centre , Montréal, Canada
3. Laboratoire de santé publique du Québec, Institut national de santé publique du Québec , Sainte-Anne-de-Bellevue, Québec, Canada