1. Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
2. Department of Microbiology, Infectious Diseases and Immunology, University of Montreal, Montreal, Quebec, Canada
3. Infection Control and Prevention Unit, Division of Pediatric Infectious Diseases and Medical Microbiology, Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Montreal, Quebec, Canada