[1] Univ Hosp Muenster, Dept Cardiol & Angiol, Munster, Germany
[2] Cleveland Clin, Pediat & Congenital Heart Surg, Cleveland, OH 44106 USA
[3] Univ Zurich, Fac Med, Zurich, Switzerland
[4] Minist Natl Guard, Dept Cardiac Sci & Cardiac Clin Res, King Abdulaziz Cardiac Ctr, Riyadh, Saudi Arabia