1 MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London W2 1PG, UK. Electronic address: b.jewell@imperial.ac.uk.
2 MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London W2 1PG, UK.
3 School of Public Health, University of California, Berkeley, Berkeley, CA, USA.
4 University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands; Institute of Infection and Global Health, University of Liverpool, Liverpool, UK.
5 College of Health Professions, Pace University, Pleasantville, New York, NY, USA.
6 School of Public Health, City University of New York, New York, NY, USA.
7 Department of Obstetrics, Gynecology, and Reproductive Services, University of California, San Francisco, San Francisco, CA, USA.