Department of Occupational Therapy, College of Medical and Health Science, Asia University, Taichung, Taiwan. Department of Public Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan. Department of Occupational and Environmental Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan. Institute of Allied Health Science, College of Medicine, National Cheng Kung University, No.1, University Road, Tainan City, 701, Taiwan. jerhao@mail.ncku.edu.tw. Department of Occupational Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan. jerhao@mail.ncku.edu.tw.