1. Department of Physiology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
2. Department of Rehabilitation Medicine, University of Washington, 1959 NE Pacific Street, P.O. Box 356490, Seattle, WA 98195-6490, USA
3. Department of Psychiatry, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
4. Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
5. Department of Electrical and Electronic Engineering, Faculty of Engineering, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand