1. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
3. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Radiology, Mayo Clinic, Minnesota, USA