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5 Green SL, "The use of chemotherapy in older patients with stage II and III colon cancer : variation by age and era of diagnosis" 10 : 132-137, 2019
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7 Katz S, "Studies of illness in the aged : the index of ADL : a standardized measure of biological and psychosocial function" 185 : 914-919, 1963
8 Surveillance, Epidemiology, and End Results, "SEER Cancer Statics Review, 2013-2017" SEER
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