Economopoulos T, Psyrri A, Dimopoulos MA. CEOP-21 versus CEOP-14 chemotherapy With or without rituximab for the first-line treatment of patients with aggressive lymphomas: Results of the HE22A99 trial of the hellenic cooperative oncology group (The Cancer Journal 2007 13 (327-334)). Cancer Journal [Internet]. 2007;13(6):403.