Sang Soo Shin1, Yoo Duk Choi2, Chung Hwan Jun3. 1. Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwang-Ju, Korea; Center for Aging and Geriatrics, Chonnam National University Medical School, Chonnam National University Hospital, Gwang-Ju, Korea. 2. Department of Pathology, Chonnam National University Medical School, Chonnam National University Hospital, Gwang-Ju, Korea. 3. Department of Internal Gastroenterology, Chonnam National University Medical School, Chonnam National University Hospital, Gwang-Ju, Korea.