[1] Seoul Natl Univ, Med Res Ctr, Coll Med, Childrens Hosp,Dept Thorac & Cardiovasc Surg, Seoul, South Korea
[2] Seoul Natl Univ, Med Res Ctr, Coll Med, Childrens Hosp,Dept Pathol, Seoul, South Korea
[3] Sejong Gen Hosp, Sejong Heart Inst, Dept Pediat Cardiol, Puchon, Kyonggi Do, South Korea
[4] Sejong Gen Hosp, Sejong Heart Inst, Dept Cardiovasc Surg, Puchon, Kyonggi Do, South Korea