Postoperative Radiotherapy for Stage II or III Non–Small-Cell Lung Cancer Using the Surveillance, Epidemiology, and End Results DatabaseLally BE, Zelterman D, Colasanto JM, et al (Wake Forest Univ, Winston-Salem, NC; Yale Univ, New Haven, Conn; Univ of Medicine and Dentistry of New Jersey, Piscataway) J Clin Oncol 24:2998–3006, 2006§