1. Dignitas International, PO Box 1071, Zomba, Malawi.
2. Department of Family and Community Medicine, University of Toronto, Toronto, Canada.
3. Management Sciences for Health, Lilongwe, Malawi.
4. Department of HIV and AIDS, Ministry of Health, Lilongwe, Malawi.
5. United States Centers for Disease Control and Prevention – Lilongwe, Lilongwe, Malawi.
6. United States Centers for Disease Control and Prevention – Zimbabwe, Harare, Zimbabwe.