[1] Yonsei Univ, Coll Med, Div Cardiol, Yonsei Cardiovasc Ctr, Seoul 120752, South Korea
[2] Inst Cardiovasc Res, Seoul, South Korea
[3] Yonsei Univ, Coll Med, Dept Diagnost Radiol, Seoul, South Korea
[4] Yonsei Univ, Coll Med, Dept Chest Surg, Seoul, South Korea