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About the article
Published Online: 2018-05-17
Compliance with Ethical Standards:
Conflict of interests: All other authors had no conflicts of interest to be declared.
Funding source: This study funded by Substance Abuse Prevention and Treatment Office (SAPTO) of Mental Health, Social Health and Addiction Department (MeHSHAD) of Ministry of Health and Medical Education, Islamic Republic of Iran.
Ethical approval: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent: Informed consent was obtained from all individual participants included in the study.
Authors’ contributions: MF and MN helped in study concept and design. MN and BA helped in analysis and interpretation of data. MN and SK drafted the manuscript. ZJ, ASH, HQ, AB, SA, MN and FR helped in critical revision of the manuscript.