1. Khon Kaen Hospital; Division of Orthopaedics; Srijan Road Khon Kaen Thailand 40000
2. Srinakarind Hospital; Department of Medicine; Khon Kaen Hospital Mittraparb Road Khon Kaen Khon Kaen Thailand 40002
3. Khon Kaen University; Department of Biostatistics and Demography, Faculty of Public Health; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002