Effect of comorbidity on the treatment and prognosis of elderly patients with non-small cell lung cancer
M L G Janssen-Heijnen, S Smulders, V E P P Lemmens, F W J M Smeenk, H J A A van Geffen, J W W Coebergh
Thorax Jul 2004, 59 (7) 602-607; DOI: 10.1136/thx.2003.018044