1 Assistant Professor, Division of Cardiovascular Medicine, University of Florida College of Medicine, Gainesville, FL, USA.
2 Medical Director, Pulmonary Thromboendarterectomy Program, Departments of Pulmonary Medicine and Critical Care Medicine, Respiratory Institute, Cleveland Clinic; Cleveland, OH, USA. E-mail: heresig@ccf.org.
3 Assistant Professor, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH, USA.