Evaluation of carbohydrate antigen 19-9 levels in subjects with diabetes mellitus in Nnamdi Azikiwe university teaching hospital, Nnewi, Nigeria von P O Manafa, E C Okoye, O Ekuma-Okereke, R N Ukibe, C Ibe, C R Chukwuanukwu, O G Chukwuma, E K Nwene, S R Ebugosi, I V Manafa, C C Manafa

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