M Chadi Alraies1, Motaz Baibars2, Allan L Klein3. 1. Department of Medicine, Division of Cardiology, University of Minnesota, Minneapolis, MN, USA. E-mail: alraies@hotmail.com. 2. Department of Medicine, Peninsula Regional Medical Center, Salisbury, MD, USA. 3. Center for Pericardial Disease, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH, USA.