Jerome T. Galea is with the Program in Global Health; Janni J. Kinsler is with the Department of Community Health Sciences, School of Public Health; and William E. Cunningham is with the Department of Medicine, Division of General Internal Medicine and Health Services Research, School of Medicine, University of California, Los Angeles. John Imrie is with the Centre for Sexual Health and HIV Research, Faculty of Population Health, University College London, London, UK. César R. Nureña is with the Escuela...