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Selection of the study cohort. DLBCL=diffuse large B-cell lymphoma; SEER=Surveillance, Epidemiology, and End Results; HMO=health maintenance organization; CHOP=cyclophosphamide, doxorubicin, vincristine, prednisone; R-CHOP=rituximab, cyclophosphamide, doxorubicin, vincristine, prednisone; CVP=cyclophosphamide, vincristine, prednisone; R-CVP=rituximab, cyclophosphamide, vincristine, prednisone.
