Cyclooxygenase-2 expression in advanced nasopharyngeal carcinoma—a prognostic evaluation and correlation with hypoxia inducible factor 1α and vascular endothelial growth factor von Chan, Charles M.L, Ma, Brigette B.Y, Hui, Edwin P, Wong, Sze.C.C, Mo, Frankie K.F, Leung, Sing. F, Kam, Michael K.M, Chan, Anthony T.C

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