1. Lunit Inc., Seoul, Korea.
2. Department of Radiology, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
3. Department of Radiology, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
4. Department of Radiology, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
5. Department of Radiology, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Korea.
6. Department of Radiology, Gyeongsang National University Hospital and College of Medicine, Gyeongsang National University, Jinju, Korea.