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Zafar Y, Abernethy AP, Abbott DH, Herndon JE, Rowe K, Kolimaga J, Conner L, Patwardhan M, Grambow S, Provenzale D. Comorbidity, age and stage at diagnosis in colorectal cancer (CRC). JOURNAL OF CLINICAL ONCOLOGY. AMER SOC CLINICAL ONCOLOGY; 2007.