1. Department of Obstetrics and Gynaecology; Korle-Bu Teaching Hospital; Accra Ghana
2. Department of Haematology; University of Ghana Medical School; Accra Ghana
3. Vanderbilt Center of Excellence in Sickle Cell Disease; Vanderbilt Children's Hospital and Vanderbilt University School of Medicine; Nashville TN USA
4. Department of Physiology; University of Ghana Medical School; Accra Ghana
5. Department of Child Health; University of Ghana Medical School; Accra Ghana
6. Aminu Kano Teaching Hospital; Kano Nigeria
7. Department of Obstetrics and Gynecology; Washington University in St Louis; St Louis MO USA
8. Statistician; Chicago IL USA
9. Department of Obstetrics and Gynaecology; University of Ghana Medical School; Accra Ghana