1. Digestive Disease Research Institute, Wonkwang University School of Medicine, Iksan, Korea, Good Breath Clinic, Gunpo, Gyeonggi-do Korea
2. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
3. Department of Internal Medicine, Kyung Hee University School of Medicine, Seoul, Korea
4. Department of Internal Medicine and Healthcare Research Institute, Healthcare System Gangnam Center, Seoul National University Hospital Gangnam Center, Seoul, Korea
5. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea
6. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Gyeongsangnam-do, Korea
7. Department of Psychiatry, Wonkwang University School of Medicine, Iksan, Korea
8. Department of Education, Hongik University, Seoul, Korea
9. Department of Internal Medicine, The Catholic University of Korea, Seoul, Korea