[1] Korea Univ, Guro Hosp, Seoul, South Korea
[2] Chungnam Natl Univ Hosp, Taejon, South Korea
[3] Inst Canc Res, Taejon, South Korea
[4] Konkuk Univ, Sch Med, Seoul, South Korea
[5] Keimyung Univ, Sch Med, Taegu, South Korea
[6] Yeungnam Univ, Sch Med, Taegu, South Korea
[7] Chonnam Natl Univ, Hwasun Hosp, Lung Canc Clin, Hwasungun, South Korea
[8] Chonnam Natl Univ, Hwasun Hosp, Lung & Esophageal Canc Clin, Hwasungun, South Korea
[9] Korea Canc Ctr Hosp, Korea Inst Radiol & Med Sci, Dept Internal Med, Seoul, South Korea
[10] Kosin Univ, Gospel Hosp, Pusan, South Korea
[11] Inje Univ, Seoul Paik Hosp, Seoul, South Korea