1. Department of Thoracic and Cardiovascular Surgery, Ewha Womans University Aorta and Vascular Hospital, Ewha Womans University Medical Center, Seoul, Korea
2. Division of Cardiothoracic Surgery, Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China
3. Division of Cardiovascular Surgery, Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
4. Department of Cardiothoracic Surgery, West German Heart and Vascular Center, University Hospital Essen, Essen, Germany