1. Clinical Epidemiology Program, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand;
2. Faculty of Public Health, Naresuan University, Phitsanulok, Thailand;
3. Department of Physical Therapy, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand;
4. Research Center in Back, Neck, Other Joint Pain and Human Performance (BNOJPH), Khon Kaen University, Khon Kaen, Thailand;
5. Department of Rehabilitation Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand