1. Resident, Department of Anaesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, USA
2. Chief Anaesthetist, Professor, Department of Anaesthesiology, Klinik für Anästhesiologie, Intensiv‐ und Schmerztherapie, Klinikum Essen‐Mitte, Essen, Germany
3. Chief Urologist, Professor, Department of Urology, Klinik fuer Urologie, Klinikum Essen‐Mitte, Essen, Germany
4. Associate Professor of Medicine, Harvard Medical School, Beth Israel Deaconess Medical Centre, Boston, USA
5. Assistant Professor, Harvard Medical School, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, USA