1. Department of Anesthesia and Pain Management; St. Anna Hospital; Geldrop; The Netherlands
2. Department of Orthopedic Surgery; St. Anna Hospital; Geldrop; The Netherlands
3. Department of Anesthesia and Pain Management; Albert Schweitzer Hospital; Sliedrecht; The Netherlands
4. Department of Anesthesiology, Pain Therapy and Palliative Care; UMC St. Radboud; Nijmegen; The Netherlands
5. Department of Anesthesia, Surgical Intensive Care and Pain Management; Tan Tock Seng Hospital; Singapore; Singapore