1. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, 1020 Pine Avenue West, Montreal, Quebec H3A 1A2, Canada.
2. Statistics Canada, Ottawa, Canada.
3. Gavi, the Vaccine Alliance, Geneva, Switzerland.
4. Centre de recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Canada.