[1] Univ Teaching Hosp, Fac Med & Biomed Sci, Dept Obstet & Gynecol, POB 1364 CHU, Yaounde, Cameroon
[2] Fac Med & Biomed Sci, Yaounde, Cameroon
[3] Fac Med & Biomed Sci, Dept Hematol & Microbiol, Yaounde, Cameroon
[4] Univ Teaching Hosp, Yaounde, Cameroon
[5] Univ Buea, Douala Gen Hosp, Fac Hlth Sci, Dept Surg Obstet & Gynecol, Buea, Cameroon