Anayawa Nyambe1, Mwansa Ketty Lubeya2. 1. School of Public Health, University of Zambia, 50110 Lusaka, Zambia. Electronic address: anayawa@gmail.com. 2. Department of Obstetrics and Gynaecology, School of Medicine, The University of Zambia, Ridgeway, Lusaka, Zambia; Young Emerging Scientists Zambia, Lusaka, Zambia.