Sixty children with ADHD were randomly selected from patients who were referred to the specialized psychiatric clinics in Tabriz, northwest of Iran. This study was verified by the Scientific and Ethics Committee of Tabriz University of Medical Sciences as a doctoral thesis . The protocol is registered in Iranian Registry of Clinical Trials (IRCT201404122660N4, http://en.search.irct.ir/view/17747). After a thorough explanation of the study purpose, caregivers of participants signed the consent form for participating in the study.