عنوان مقاله [English]
نویسنده [English]چکیده [English]
In this paper, the epidemiological researches on addiction and drug use in Iran were reviewed from the methodological perspective. Specifically, the methods of estimating the number of drug users were evaluated and criticized. Bias is an important problem in these researches, specially selection and measurement bias. These types of bias mostly provide an underestimation.