Establishing a single-sex controlled human Schistosoma mansoni infection model for Uganda: protocol for safety and dose-finding trial by Abaasa, A, Egesa, M, Driciru, E, Koopman, JPR, Kiyemba, R, Sanya, RE, Nassuuna, J, Ssali, A, Kimbugwe, G, Wajja, A, van Dam, GJ, Corstjens, PLAM, Cose, S, Seeley, J, Kamuya, D, Webb, EL, Yazdanbakhsh, M, Kaleebu, P, Siddiqui, AA, Kabatereine, N, Tukahebwa, E, Roestenberg, M, Elliott, AM