1. Department of International Public Health, Liverpool School of Tropical Medicine , Liverpool , L3 5QA, UK
2. National Schistosomiasis Control Programme, National Neglected Tropical Disease Programme , Ministry of Health, 1000, Monrovia 10 , Liberia
3. National Neglected Tropical Disease Programme, Ministry of Health , 1000, Monrovia 10 , Liberia
4. Bong County Neglected Tropical Disease Programme, Ministry of Health , 1000, Monrovia 10 , Liberia
5. Nimba County Neglected Tropical Disease Programme, Ministry of Health , 1000, Monrovia 10 , Liberia