1. Department of Internal Medicine; Catholic Kwandong University College of Medicine; International St. Mary's Hospital; Incheon Metropolitan City Korea
2. Institute for Integrative Medicine; Catholic Kwandong University College of Medicine; International St. Mary's Hospital; Incheon Metropolitan City Korea
3. Department of Internal Medicine; Yonsei University College of Medicine; Seoul Korea
4. Institute of Gastroenterology; Yonsei University College of Medicine; Seoul Korea
5. Department of Infectious Diseases; Mongolian National University of Medical Sciences; Ulaanbaatar Mongolia