[1] Kyung Hee Univ, Grad Sch, Dept Med, Seoul, South Korea
[2] Kyung Hee Univ, Kyung Hee Univ Hosp, Coll Med, Dept Radiol, Seoul, South Korea
[3] Kyung Hee Univ, Coll Med, Dept Cardiothorac Surg, Seoul, South Korea
[4] Kyung Hee Univ Hosp Gangdong, Dept Radiol, Seoul, South Korea