1. Department of Anesthesia and Intensive Care, The Chinese University of Hong Kong, Faculty of Medicine, Prince of Wales Hospital, Hong Kong, China
2. Department of Radiology, Orthopedic and Hand MRI (OHM) Novena, Novena Specialist Centre, Singapore
3. Department of Anesthesiology, Mahidol University, Faculty of Medicine, Siriraj Hospital, Bangkok, Thailandand
4. Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden.