1. Department of Medicine, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
2. Division of Cardiology, Department of Medicine, Emory Clinical Cardiovascular Research Institute, Emory University School of Medicine, 201 Dowman Drive, Atlanta, GA 30322, USA
3. Division of Cardiac Surgery, Department of Surgery, Ohio State University, Columbus, OH 43210, USA