%0 Journal Article %T Effect of tramadol addiction alone and its co-abuse with cannabis on urinary excretion of Copper, Zinc, and Calcium among Egyptian addicts %A Ahmed Nada %A Ahmed Shouman %A Elsayed Eltamany %A Omayma El-Gamel %A Wesam Ali %J Archive of "African Health Sciences". %D 2018 %R 10.4314/ahs.v18i3.35 %K Enzymuria %K copper %K zinc %K calcium %K reabsorption impairment %K tubular structural integrity %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6307004/