1. Caribbean Institute for Health Research, The University of the West Indies; Sickle Cell Unit; 7 Ring Road, Mona Campus Kingston 7 Jamaica
2. Medical College of Wisconsin; Section of Hematology/Oncology, Department of Pediatrics; 8701 Watertown Plank Road Milwaukee USA MFRC 3018
3. University of the West Indies; Faculty of Medical Sciences; c/o Andrews Memorial Hospital, 27 Hope Road Kingston Jamaica