[1] Univ Ryukyus, Grad Sch Hlth Sci, Dept Global Hlth, 207 Uehara, Nishihara, Okinawa 9030215, Japan
[2] Nagasaki Univ, Inst Trop Med, Kenya Res Stn, Nagasaki, Japan
[3] Japanese Consortium Global Sch Hlth & Res, Nishihara, Okinawa, Japan
[4] Kenya Govt Med Res Ctr, Eastern & Southern Africa Ctr Int Parasite Contro, Nairobi, Kenya
[5] Univ Philippines Manila, Coll Publ Hlth, Manila, Philippines