[1] Univ Ulsan, Coll Med, Asan Med Ctr, Div Breast & Endocrine, Seoul, South Korea
[2] Seoul Natl Univ, Coll Med, Seoul, South Korea
[3] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Breast & Endocrine Surg, Seoul, South Korea
[4] Yonsei Univ, Coll Med, Seoul, South Korea
[5] Natl Canc Ctr, Res Inst Natl Canc Control & Evaluat, Res Inst & Hosp, Canc Biostat Branch, Goyang, South Korea
[6] Sungkyunkwan Univ, Sch Med, Samsung Changwon Hosp, Chang Won, South Korea
[7] Seoul Natl Univ, Coll Med, Seoul Natl Univ Hosp, Canc Res Inst, Seoul, South Korea
[8] Yonsei Univ, Coll Med, Div Med Oncol, Seoul 120749, South Korea