1. Lunit Inc, Seoul, Korea.
2. Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.
3. Department of Radiology, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
4. Department of Radiology, Seoul National University-Seoul Metropolitan Government Boramae Medical Center, Seoul, Korea.
5. Department of Radiology, Korea University Anam Hospital, Seoul, Korea.
6. Department of Radiology, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Korea.