1. Sickle Cell UnitTropical Medicine Research Institute, University of the West Indies, Mona Campus, Kingston 7, Jamaica, W.I
2. Epidemiology Research UnitTropical Medicine Research Institute, University of the West Indies, Mona Campus, Kingston 7, Jamaica, W.I
3. Dean's OfficeFaculty of Medical Science, University of the West Indies, Mona Campus, Kingston 7, Jamaica, W.I.