Active acromegaly is associated with enhanced left ventricular contractility: Results from the three-dimensional speckle-tracking echocardiographic MAGYAR-Path Study Árpád Kormányos; Péter Domsik; Anita Kalapos; Nándor Gyenes; Zsuzsanna Valkusz; Csaba Lengyel; Tamás Forster; Attila Nemes;