1. From the Department of Pediatrics and Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada;
2. Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada;
3. Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia;
4. Department of Pediatrics, University of Montreal, Montreal, Quebec, Canada;
5. Direction de la sante publique de Montreal-Centre, Montreal, Quebec, Canada;
6. Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada;
7. Department of Pediatrics, University of Manitoba, Winnipeg, Manitoba;
8. Department of Pediatrics, McGill University, Montreal, Quebec, Canada.