1. Laboratory of Immunogenetics and Transplant Biology, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
2. International Center for Transplantation in Thalassemia and Sickle Cell Anemia, IME Foundation; Policlinic of the University of Tor Vergata; Rome Italy
3. Sickle Cell Foundation Nigeria; Lagos Nigeria
4. National Hospital; Abuja Nigeria
5. Laboratory of Anthropology, Genetics and Peopling History, Department of Genetics and Evolution-Anthropology Unit; University of Geneva; Geneva Switzerland