[1] Kilimanjaro Christian Med Univ Coll KCMUCo, Inst Publ Hlth, POB 2240, Moshi, Tanzania
[2] Lund Univ, Dept Translat Med, S-21428 Malmo, Sweden
[3] London Sch Hyg & Trop Med, Fac Epidemiol & Populat Hlth, London WC1E 7HT, England
[4] Kilimanjaro Christian Med Ctr, Joint Malaria Program, POB 3010, Moshi, Tanzania
[5] Reg Adm & Local Govt, Presidents Off, POB 1923, Dodoma, Tanzania
[6] Minist Hlth, Immunizat & Vaccine Dev Program, POB 743, Dodoma, Tanzania
[7] State Univ Zanzibar, Sch Nat Sci, POB 146, Tunguu, Tanzania
[8] United Nations Children Fund UNICEF, POB 4076, Dar Es Salaam, Tanzania
[9] KCMC Hosp, Community Hlth Dept, POB 3010, Moshi, Tanzania