1. College of Medical Sciences, University of Calabar; Obstetrics and Gynaecology; Calabar Cross River State Nigeria
2. College of Medical Sciences, University of Calabar; Internal Medicine; PMB 1115 Calabar Cross River State Nigeria 540001
3. University of Calabar Teaching Hospital (ITDR/P); Institute of Tropical Diseases Research and Prevention; Moore Road Calabar Cross River State Nigeria
4. Faculty of Clinical Sciences, College of Medicine, University of Lagos, Idi-Araba; Experimental and Maternal Medicine Unit, Department of Obstetrics and Gynaecology; Lagos Nigeria
5. University of Calabar; Calabar Nigeria