1. Department of Orthopaedics, Faculty of Medicine, Thammasat University, Pathumthani, Thailand
2. Chulabhorn International College of Medicine, Thammasat University, Pathumthani, Thailand
3. Department of Anesthesia, Thammasat University, Pathumthani, Thailand
4. Department of Orthopaedics, Sirindhorn Hospital, Bangkok, Thailand