1. Department of Internal Medicine and Healthcare Research Institute, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, South Korea;
2. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea;
3. Department of Radiology, Seoul National University Hospital and College of Medicine, Seoul, South Korea;
4. Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea;
5. Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, South Korea.