Mohammad Nijres B, Bokowski J, Al-Kubaisi M, Abdulla RI, Murphy JJ, Awad S, Diab KA. Use of Speckle Tracking Echocardiography to Assess Left Ventricular Systolic Function in Patients with Surgically Repaired Tetralogy of Fallot: Global and Segmental Assessment. Pediatr Cardiol. 2018 Dec; 39(8):1669-1675.