1. Division of Rheumatology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
2. Division of Gastroenterology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
3. Department of Nuclear Medicine, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Nuclear Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.