1. Department of Global Public Health and Korean Medicine Management, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
2. Department of Preventive Medicine, College of Korean Medicine, Woosuk University, 61, Seonneomeo 3-gil, Wansan-gu, Jeonju-si, Jeollabuk-do 54986, Republic of Korea
3. Department of Preventive Medicine, College of Korean Medicine, Kyung Hee University, 1 Hoegi, Seoul 130-701, Republic of Korea