Drosin M. Mulenga, BSW, is a Program Officer, Population Council, Lusaka, Zambia. Joseph G. Rosen, PhD, MSPH, is a Assistant Scientist, Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA. Lunda Banda, BA, is a Program Officer, Population Council, Lusaka, Zambia. Maurice Musheke, PhD, MPH, is a Research Manager, Population Council, Lusaka, Zambia. Michael T. Mbizvo, PhD, MPhil, MSc, is a Senior Associate, Population Council, Lusaka, Zambia. Henry F. Raymond, DrPH, MPH, is a Associate Professor, Department of Biostatistics and Epidemiology, School of Public Health, Rutgers University, Piscataway, New Jersey, USA. Ryan Keating, MPH, is a Program Manager, Institute for Global Health Sciences, University of California, San Francisco, California, USA. Harold Witola, PhD, MSc, is a Director of Programs, National HIV/AIDS/STI/TB Council, Ministry of Health, Government of the Republic of Zambia, Lusaka, Zambia. Lyson Phiri, BS, is a Program Officer, Population Council, Lusaka, Zambia. Scott Geibel, PhD, MPH, is a Senior Associate, Population Council, Washington, District of Columbia, USA. Waimar Tun, PhD, MHS, is a Senior Associate, Population Council, Washington, District of Columbia, USA, Nanlesta Pilgrim, PhD, MPH, is a Senior Associate, Population Council, Washington, District of Columbia, USA.

*Corresponding author: Waimar Tun, e-mail: [email protected]