1. Ifakara Health Research and Development Centre, Ifakara, Tanzania;Hospital Clínic, Barcelona, Spain;
2. Ifakara Health Research and Development Centre, Ifakara, Tanzania;
3. Hospital Clínic, Barcelona, Spain;
4. Ministry of Health, Dar es Salaam, Tanzania;
5. Swiss Tropical Institute, Basel, Switzerland;
6. District Medical Officer, Kilombero, Morogoro Region, Tanzania