1. Department of Rehabilitation Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
2. Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Germany
3. Interdisciplinary Pain Unit of the University Hospital, Ludwig-Maximilian-University, Munich, Germany
4. Department of Anaesthesiology, Ludwig-Maximilian-University, Munich, Germany