1. Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea.
2. Department of Radiology, Korea University College of Medicine, Korea University Guro Hospital, Gurodong-ro, Guro-gu, Seoul 08308, Korea.
3. Department of Radiology, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.