Division of Cardiovascular Surgery, University of Florida Health, Gainesville, FL, USA

Department of Cardiothoracic Surgery, Weill Cornell Medicine, New York, NY, USA

Cardiothoracic and Vascular Surgery - Lankenau Heart Institute, Main Line Health, Wynnewood, PA, USA

Division of Cardiac Surgery, Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA

Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria

Division of Cardiovascular Surgery, Department of Surgery, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, Japan

Department of Cardiovascular Sciences, Brody School of Medicine, East Carolina University, Greenville, NC, USA

Department of Surgery, University of Tennessee, Memphis; Baptist Medical Group, Memphis, TN, USA

Department of Human Pathology in Adulthood and Childhood 'G. Barresi', University Hospital 'G. Martino', The University of Messina, Messina, Italy

Department of Cardiac Surgery, Klinikum Nürnberg, Nuremberg, Germany

University of New Mexico Albuquerque, NM, USA

Cardiac Surgery Department, Heart Area, Hospital Universitario Central de Asturias, Oviedo, Spain

National Cerebral and Cardiovascular Center, Fujishirodai, Suita, Osaka, Japan

Division of Cardiovascular and Thoracic Surgery, Missouri Baptist Medical Center, St Louis, MO, USA

Department of Cardiac Surgery, S Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy

Department of Cardiac Surgery, Montreal Heart Institute, Université de Montréal, Montreal, Canada

Department of Cardio-Thoracic, Santa Maria University Hospital, Lisbon, Portugal

Department of Cardiothoracic Surgery, Saint Thomas West Hospital, Nashville, TN, USA

Department of cardiothoracic surgery, University Medical Center, Maastricht, the Netherlands