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APA Citation
Janssen-Heijnen, M. L. G., Smulders, S., Lemmens, V. E. P. P., Smeenk, F. W. J. M., van Geffen, H. J. A. A., & Coebergh, J. W. W. (2004). effect of comorbidity on the treatment and prognosis of elderly patients with non-small cell lung cancer. Thorax, 59(7), 602–607. http://access.bl.uk/ark:/81055/vdc_100135545393.0x000021