1. Department of Anaesthesiology, University Hospital of Graz, Auenbruggerplatz 29, A‐8036 Graz, Austria,
2. Department of Plastic Surgery,
3. Department of Thoracic and Hyperbaric Surgery,
4. Department of Surgery and
5. Department of Dermatology and Venerology, University Hospital of Graz, Auenbruggerplatz 29, A‐8036 Graz, Austria