Columbia University - ICAP, Columbia University - ICAP, Centers for Disease Control and Prevention, Lesotho, World Food Programme, Italy, Columbia University - ICAP, Ministry of Health and Social Services, Namibia, Columbia University - ICAP, Government of Tanzania - Ministry of Health, Community Development, Gender, Elderly and Children, World Food Programme, Italy, Central Statistical Office, Eswatini, U.S. Centers for Disease Control and Prevention (CDC), Columbia University - ICAP, Columbia University - ICAP, U.S.Centers for Disease Control and Prevention (CDC), Centers for Disease Control and Prevention, Zambia, Centers for Disease Control and Prevention, Zambia, Republic of Uganda Ministry of Health, U.S. Centers for Disease Control and Prevention (CDC), Centers for Disease Control and Prevention, Tanzania, Columbia University - ICAP, Ministry of Health Zambia, Centers for Disease Control and Prevention, Uganda, Centers for Disease Control and Prevention, Zambia, University of California, San Francisco (UCSF) - Department of Epidemiology and Biostatistics and Columbia University - ICAP