1 Division of Pediatric Critical Care, Department of Pediatrics, McGill University Health Centre, Montreal, QC, Canada; The Montreal Children's Hospital, Montreal, QC, H4A 3J1, Canada; Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Canada. Electronic address: patricia.fontela@mcgill.ca.
2 Division of Pediatric Infectious Diseases, Department of Pediatrics, McGill University Health Centre, Montreal, QC, Canada; Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Canada.