Prevalence of Self-Administered Drug Use among Population of Tehran, Iran oleh Mohammadreza Yazdan Nasab, Erfan Babahoseinpour, Jamil Kheirvari Khezerlo, Mohsen Tabasi, Fatemeh Mavalizadeh, Abdolrazagh Barzegar, Mohammad Reza Ghadirzadeh, Isa Akbarzadeh, Amin Radmanesh