1. 4th Medical Department; Aristotle University of Thessaloniki; Hippokratio Hospital; Thessaloniki Greece
2. Department of Gastroenterology; National and Kapodistrian University of Athens; Laiko General Hospital; Athens Greece
3. Mitera Hospital; Athens Greece
4. 2nd Medical Department; Hippokratio Hospital; University of Athens; Athens Greece
5. Department of Medicine and Research Laboratory of Internal Medicine; Medical School; University of Thessaly; Larissa Greece
6. Department of Internal Medicine; Hospital of Rhodes; Rhodes Greece
7. Department of Gastroenterology; University Hospital of Patras; Patras Greece
8. 3rd Medical Department; Papageorgiou Hospital; Aristotle University of Thessaloniki; Thessaloniki Greece
9. Thalassaemia Unit; Hospital of Patras; Patras Greece
10. Thalassaemia Unit; Hippokratio Hospital; Aristotle University of Thessaloniki; Thessaloniki Greece
11. Agia Sofia Children Hospital; University of Athens; Athens Greece
12. Thalassaemia Unit; Hippokratio Hospital; Athens Greece
13. Thalassaemia Unit; General Hospital; Athens Greece