| Affiliation: | 1. School of Social and Community Medicine, University of Bristol, Bristol, UK;2. Bristol Veterinary School, University of Bristol, Bristol, UK;3. Department of Infectious Disease Epidemiology, Imperial College London, London, UK;4. Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland;5. Vaccine and Infectious Disease Division, and Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA;6. Department of Medicine, University of Washington, Seattle, WA, USA |
