[1] Natl Publ Hlth Inst, Liberia Field Epidemiol & Lab Training Programme, Congo Town, Montserrado, Liberia
[2] NFELTP, Abuja, Nigeria
[3] Ahmadu Bello Univ, Dept Community Med, Zaria, Kaduna, Nigeria
[4] Univ Ibadan, Dept Epidemiol & Med Stat, Ibadan, Oyo, Nigeria
[5] Fed Minist Hlth, Natl Malaria Programme, Abuja, Nigeria