1. School of Medicine, Walailak University, Thasala, Nakhon Si Thammarat, Thailand
2. Walailak University Hospital, Thasala, Nakhon Si Thammarat, Thailand
3. Thasala Hospital, Thasala, Nakhon Si Thammarat, Thailand
4. Department of Orthopaedic Surgery and Physical Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand