1. Institute of Medical Research & Medicinal Plants, BP 4424, Yaounde, Cameroon
2. National Onchocerciasis Task Force, Khartoum, Sudan
3. TEYEN Research Foundation, Yaounde, Cameroon
4. Human Development African Region, World Bank, Washington DC, USA
5. African Programme for Onchocerciasis Control, Ouagadougou, Burkina Faso