1. Clinic for Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum NRW, Bad Oeynhausen, Ruhr-University Bochum, Germany
2. Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
3. Clinic for Thoracic and Cardiovascular Surgery, Erich & Hanna Klessmann-Institute for Research and Development, Herz- und Diabeteszentrum NRW, Bad Oeynhausen, Ruhr-University Bochum, Germany