1 Department of Cardiovascular Medicine and Department of Thoracic and Cardiovascular Surgery Cleveland Clinic, Center for Diagnosis and Treatment of Pericardial Disease, Cleveland Clinic, 9500 Euclid Ave., Desk J1-5, Cleveland, OH, USA.
2 Department of Cardiovascular Medicine and Department of Thoracic and Cardiovascular Surgery Cleveland Clinic, Center for Diagnosis and Treatment of Pericardial Disease, Cleveland Clinic, 9500 Euclid Ave., Desk J1-5, Cleveland, OH, USA. kleina@ccf.org.