Shu-Yu Tai1, Tsung-Hsueh Lu1. 1. Shu-Yu Tai is with the Department of Family Medicine, Kaohsiung Municipal Ta-Tung Hospital, and the Department of Family Medicine, Kaohsiung Medical University Hospital, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Tsung-Hsueh Lu is with the Department of Public Health, College of Medicine, National Cheng Kung University, Tainan.