1. Experimental and Maternal Medicine Unit; Department of Obstetrics and Gynecology; Faculty of Clinical Sciences; College of Medicine; University of Lagos; Idi-Araba, Lagos Nigeria
2. Institute of Tropical Diseases Research and Prevention; University of Calabar Teaching Hospital; Calabar Nigeria
3. Cochrane Nigeria; Institute of Tropical Diseases Research and Prevention; University of Calabar Teaching Hospital; Calabar Nigeria
4. College of Medical Sciences; University of Calabar; Calabar Nigeria