Funding for this research was provided by:
Tabriz University of Medical Sciences (TBZMED.REC.1394.593)
Received: 30 September 2020
Accepted: 10 February 2021
First Online: 25 February 2021
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the declaration of Helsinki. Parental consent form was delivered to girls < 16 for filling at home, then returned to researcher. Additionally written informed consent was obtained from all participants themselves. Approval for this trial was granted by the ethical committee of Tabriz University of Medical Sciences (Ethical Code: TBZMED.REC.1394.593).
: Not applicable.
: The authors declare that they have no competing interests.