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Article History

Received: 27 March 2019

Accepted: 31 July 2019

First Online: 14 August 2019

Ethics approval and consent to participate

: The study procedure was approved by the Medical Ethics Committee of Mazandaran University of Medical Sciences [Grant number: IR. MAZUMS.REC13941571]. The present study only involved persons who gave their informed consent. For this, verbal informed consent was obtained from all persons before the start of the study, and all members of the samples completed informed written consent after being informed about the aims of the research. The FDS was distributed among the participants while they remained anonymous; there was no private information that could enable association of any answers with any of the persons in the present study. To protect the rights and interests of all samples, no records of consent, by name, were preserved. Each completed instrument was given to the research fellow on the same day of data collection.

: Not applicable.

: The authors declare that they have no competing interests. Besides, Maryam Khazaee-Pool as a member of the editorial board (Associate Editor) of BMC Public Health journal declare that she has no competing interests.