1 Division of Pediatric Infectious Diseases, Departments of Pediatrics and Microbiology, Montreal Children's Hospital, McGill University Health Centre;
2 Department of Microbiology, CHU Ste-Justine, McGill University Health Centre, Montreal, Quebec.
3 Department of Microbiology, Jewish General Hospital, McGill University Health Centre, Montreal, Quebec.
4 Department of Diagnostic Radiology, Montreal Children's Hospital, McGill University Health Centre, Montreal, Quebec.