1. School of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand.
2. Research Center in Back, Neck, Other Joint Pain and Human Performance, Khon Kaen University, Khon Kaen, Thailand.
3. Rehabilitation Department, Warinchamrab Hospital, Ubonratchathani, Thailand.
4. Tokyo Metropolitan University, Tokyo, Japan.