1. Sightsavers, Haywards Heath , RH16 3BZ, UK
2. Sightsavers, Kaduna , P.O. Box 503, Nigeria
3. Neglected Tropical Diseases, Ministry of Health , Monrovia, P.O. Box 10-9009, Liberia
4. Sightsavers , 5673 Conakry, Guinea
5. Health Services, Ministry of Health , Monrovia, P.O. Box 10-9009, Liberia
6. Public Health, Federal Ministry of Health , Abuja 900104, Nigeria
7. National Program Against Neglected Tropical Diseases, Ministry of Health , Conakry, BP 585, Republic of Guinea