1. National Institute for Medical Research, PO Box 9653, Dar es Salaam, United Republic of Tanzania.
2. Ifakara Health Institute, Dar es Salaam, United Republic of Tanzania.
3. Ministry of Health and Social Welfare, Dar es Salaam, United Republic of Tanzania.
4. CTS Global USA/Center for Disease Control and Prevention, Dar es Salaam, United Republic of Tanzania.
5. World Health Organization, Geneva, Switzerland.