Prevalence of nonmedical use of prescription-type opioids, methylphenidate, and sedative-hypnotics among university students in the south of Iran: a regression analysis by Abbas Abbasi-Ghahramanloo, Mahmoud Khodadost, Farhad Moradpour, Mohammad Reza Karimirad, Razieh Kamali, Foroogh Ziarati

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