[1] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Oncol, Seoul, South Korea
[2] Chonnam Natl Univ, Sch Med, Hwasun Hosp, Lung Canc Clin,Pulm Med, Jeonnam, South Korea
[3] Korea Univ, Guro Hosp, Pulmonol Allergy & Crit Care Med, Seoul, South Korea
[4] Kyungpook Natl Univ, Chilgok Hosp, Lung Canc Ctr, Daegu, South Korea
[5] RTI Hlth Solut, Hlth Econ Grp, Durham, NC USA
[6] AstraZeneca, Biometr Oncol, Cambridge, England
[7] AstraZeneca, Oncol Business Unit, Cambridge, England