1. Department of Preventive Medicine; School of Medicine; Keimyung University; Daegu Korea
2. College of Nursing; Keimyung University; Daegu Korea
3. Department of Internal Medicine; DongSan Medical Center; Keimyung University; Daegu Korea
4. Department of Statistics and Actuarial Science; Soongsil University; Seoul Korea
5. Department of Pharmacology; School of Medicine and Kohwang Medical Research Institute; Kyung Hee University; Seoul Korea