1. Department of Gastroenterology, College of Korean Medicine, Kyung Hee University, Seoul, Republic of Korea.
2. Department of Gastroenterology, Center for Neurointestinal Health, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
3. Acupuncture and Meridian Science Research Center, College of Korean Medicine, Kyung Hee University, Seoul, Republic of Korea.
4. Department of Statistics, Sookmyung Women's University, Seoul, Republic of Korea.
5. Department of Gastroenterology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.