University of British Columbia (UBC) - Department of Pediatrics, Harvard University - Division of Pharmacoepidemiology and Pharmacoeconomics, University of British Columbia (UBC) - Department of Medicine, McGill University - Respiratory Epidemiology and Clinical Research Unit, Istituti Clinici Scientifici Maugeri IRCCS - Servizio di Epidemiologia Clinica delle Malattie Respiratorie, Istituti Clinici Scientifici Maugeri IRCCS, Public Health Consulting Group, National Health Laboratory Services (NHLS) - National Institute for Communicable Diseases, Western Cape Government - Health Intelligence, McGill University - Division of Respiratory Medicine and McGill University - School of Population and Global Health