1. Department of Social and Preventive Medicine; Université de Montréal; Montréal Québec Canada
2. Hôpital Sainte-Justine; Montréal Québec Canada
3. Merck Canada, Inc.; Montréal Québec Canada
4. Department of Otorhinolaryngology; Hôpital Sainte-Justine, Université de Montréal; Montréal Québec Canada
5. Department of Microbiology and Infectious Diseases; Centre hospitalier de l'Université de Montréal; Montréal Québec Canada
6. Department of Obstetrics and Gynecology and CRCHUM; Université de Montréal; Montréal Québec Canada
7. Department of Pathology; Sainte-Justine Hospital, Université de Montréal; Montréal Québec Canada