P1513: LOW VITAMIN D LEVELS ARE ASSOCIATED WITH INCREASED CARDIAC IRON UPTAKE IN THALASSEMIA MAJOR. (23rd June 2022) - Meloni, A.; Pistoia, L.; Vassalle, C.; Maffei, S.; Fotzi, I.; Rosso, R.; Serra, M.; Quota, A.; Bitti, P. P.; Carrai, V.; Positano, V.; Cademartiri, F.