Gonadal and Cortisol Hormone Profile among Male Chronic Khat, Marijuana, and Heroin Abuses by Meseret Yibrah, Abebe Edao Negesso, Atsbeha Gebregziabher, Feyissa Challa, Kissi Mudi, Feven Tesfay, Mehari Gebretsadkan, Samuel Kinde, Daniel Asmelash

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