EXERCISE STRESS ECHOCARDIOGRAPHY WITH TISSUE DOPPLER IMAGING (TDI) DETECTS EARLY SYSTOLIC DYSFUNCTION IN BETA-THALASSEMIA MAJOR PATIENTS WITHOUT CARDIAC IRON OVERLOAD. Mediterr J Hematol Infect Dis 2012, 4 (1), e2012037. https://doi.org/10.4084/mjhid.2012.037.