1. Department of Thoracic Surgery, Klinik am Park, Klinikum Westfalen, Lünen, Germany
2. Faculty of Medicine, University of Witten/Herdecke, Witten, Germany
3. Department of Anesthesiology, Intensive Care Medicine and Pain Therapy, Knappschaftskrankenhaus Dortmund, Klinikum Westfalen, Dortmund, Germany
4. Department of General Visceral, Thoracic and Endocrine Surgery, Augusta Hospital, Düsseldorf, Germany