1. Department of Orthopaedics, School of Medicine, University of Phayao, Phayao, Thailand
2. Division of Research, School of Medicine, University of Phayao, Phayao, Thailand
3. Department of Orthopaedics, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand
4. Department of Orthopaedics, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand