[1] Univ Lagos, Lagos Univ Teaching Hosp, Lagos, Nigeria
[2] KorleBu Teaching Hosp, Accra, Ghana
[3] Natl Hosp Abuja, Abuja, Nigeria
[4] Yaounde Gyneco Obstet & Pediat Hosp, Yaounde, Cameroon
[5] Univ Yaounde I, Fac Med & Biomed Sci, Yaounde, Cameroon
[6] Edward Francis Small Teaching Hosp, Banjul, Gambia
[7] Univ Gambia, Serrekunda, Gambia
[8] John F Kennedy Med Ctr, Dept Anesthesiol, Crit Care & Pain Management Dept, Monrovia, Liberia
[9] Univ Liberia, Dagliotti Sch Med, Monrovia, Liberia
[10] Douala Gen Hosp, Dept Intens Care, Douala, Cameroon
[11] Univ Douala, Fac Med & Pharmaceut Sci, Douala, Cameroon
[12] Univ Calabar, Univ Calabar Teaching Hosp, Calabar, Nigeria
[13] Univ Ibadan, Univ Coll Hosp, Ibadan, Nigeria
[14] Komfo Anokye Teaching Hosp, Kumasi, Ghana
[15] Korle Bu Teaching Hosp, Accra, Ghana