1. 1Department of Laboratory Medicine, Edward Francis Small Teaching Hospital, Independence Drive, Banjul, The Gambia
2. 2School of Life Sciences, University of Westminster, 115 New Cavendish Street, London, W1W 6UW, UK
3. 3Department of Obstetrics and Gynaecology, Edward Francis Small Teaching Hospital, Independence Drive, Banjul, The Gambia
4. 4School of Life Sciences, University of Sussex, Falmer, BN1 9QG, UK