1. YR Gaitonde Centre for AIDS Research and Education, Chennai, India
2. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
4. Department of Anthropology, Durham University, Durham, UK
5. Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA