Affiliation: | Yura Ahn, Gil-Sun Hong, Ju Hee Lee, Choong Wook Lee, Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine & Asan Medical Center, Seoul 05505, South Korea Seon-Ok Kim, Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, South Korea |