[1
]
University Clinic for Cardiovascular Surgery, University Hospital Zurich, Zurich,
Switzerland, and University Heart Center Freiburg-Bad Krozingen, Bad Krozingen, Germany.
Electronic address: martin.czerny@uniklinik-freiburg.de.
[2
]
University Clinic for Cardiovascular Surgery, University Hospital Bern, Bern, Switzerland.
[3
]
Department of Cardiac Surgery, Heart Center Leipzig, Leipzig, Germany.
[4
]
Department for Cardiac Surgery, University Hospital Munich, Munich, Germany.
[5
]
Division of Thoracic and Cardiovascular Surgery, Johann Wolfgang Goethe University,
Frankfurt, Germany.
[6
]
Department of Vascular and Endovascular Surgery, Clinic Hubertus Hospital, Berlin,
Germany.
[7
]
Institute for Medical Biostatistics, Epidemiology and Informatics, Medical Centre
of the Johannes Gutenberg University Mainz, Mainz, Germany.