1. Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich-Schiller-University , Jena, Germany
2. Department of Cardiothoracic Surgery, Weill Cornell Medicine , New York, NY, USA
3. Department of General Surgery, Maimonides Medical Center , Brooklyn, NY, USA
4. Nuffield Department of Surgical Sciences, University of Oxford , Oxford, UK
5. Samuel J. Wood Library & CV Starr Biomedical Information Center, Weill Cornell Medicine , New York, NY, USA
6. Division of Cardiac Surgery, Department of Surgery, University of Toronto , Toronto, ON, Canada