[1] Catholic Univ Cent Africa, Sch Hlth Sci, Yaounde, Cameroon
[2] Univ Yaounde, Teaching Hosp, Lab Biochem, Yaounde, Cameroon
[3] Univ Yaounde I, Fac Med & Biomed Sci, Dept Physiol Sci & Biochem, Yaounde, Cameroon
[4] Chantal Biya Fdn, Mother & Child Ctr, Sickle Cell Dis Unit, Yaounde, Cameroon
[5] Univ Yaounde I, Fac Med & Biomed Sci, Dept Publ Hlth, POB 1364, Yaounde, Cameroon
[6] Groote Schuur Hosp, Dept Med, ZA-7925 Cape Town, South Africa
[7] Univ Cape Town, ZA-7925 Cape Town, South Africa
[8] Med Diagnost Ctr, Yaounde, Cameroon
[9] Bertoua Reg Hosp, Pediat Unit, Bertoua, Cameroon
[10] Univ Yaounde I, Fac Med & Biomed Sci, Dept Obstet & Gynecol, Yaounde, Cameroon