1. Department of Radiology, Chonnam National University Medical School, Gwangju 61469, Korea.
2. Center for Aging and Geriatrics, Chonnam National University Medical School, Gwangju 61469, Korea.
3. Department of Hepato-Pancreato-Biliary Surgery, Chonnam National University Medical School, Gwangju 61469, Korea.
4. Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61469, Korea.