Adams, Jr SG, Britt (DiBenedetti) DM, Godding PR, Khansur TI, Bulcourf BB. Relative contribution of the Karnofsky Performance Status Scale in a multi-measure assessment of quality of life in cancer patients. Psychooncology. 1995 Oct;4(3):239-46. doi: 10.1002/pon.2960040310