Affiliation: | 1. Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom.; 2. Immunisation, Hepatitis and Blood Safety Department, Public Health England, London, United Kingdom.; 3. Immunobiology Unit, University College London, London, United Kingdom.; 4. International Vaccine Access Center, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America, |