Can Opium Use Contribute to a Higher Risk of Colorectal Cancers? A Matched Case-control Study in Iran - NAGHIBZADEH-TAHAMI, Ahmad; YAZDI FEYZABADI, Vahid; KHANJANI, Narges; ASHRAFI-ASGARABAD, Ahad; ALIZAEH, Hosniyeh; BORHANINEJAD, Vahid Reza; MORADI-JOO, Mohammad; ZEINALI, Masoud; ZAHEDI, Mohammad Javad; AGHAEE-AFSHAR, Mahmoud; HAGHDOOST, Ali Akbar (Iranian Journal of Public Health, 2016)