1. Department of Anaesthesia; Centre of Head and Orthopaedics; Copenhagen University Hospital; Rigshospitalet; Copenhagen; Denmark
2. Department of Anaesthesia; Abdominal Centre; Copenhagen University Hospital; Rigshospitalet; Copenhagen; Denmark
3. Department of Urology; Abdominal Centre; Copenhagen University Hospital,; Rigshospitalet; Copenhagen; Denmark
4. Section of Acute Pain Management; Copenhagen University Hospital; Rigshospitalet; Copenhagen; Denmark