1. Department of Internal Medicine; Yonsei University College of Medicine; Seoul Republic of Korea
2. Institute of Gastroenterology; Yonsei University College of Medicine; Seoul Republic of Korea
3. Department of Internal Medicine; Catholic Kwandong University College of medicine; International St. Mary's Hospital; Incheon Republic of Korea
4. Institute for Integrative Medicine; Catholic Kwandong University College of medicine; International St. Mary's Hospital; Incheon Republic of Korea
5. Department of Biostatistics; Yonsei University College of Medicine; Seoul Korea