1. Department of Medicine, Graduate School, Kyung Hee University, Dongdaemun-ku, Seoul, Republic of Korea
2. Department of Radiology, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Dongdaemun-ku, Seoul, Republic of Korea
3. Department of Radiology, National Police Hospital, Songpa-gu, Seoul, Republic of Korea
4. Department of Radiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Gangdong-gu, Seoul, Republic of Korea