Funding for this research was provided by:
Babol University of Medical Sciences (IR.MUBABOL.HRI.REC.1397.289)
Received: 4 April 2020
Accepted: 24 July 2020
First Online: 30 July 2020
Ethics approval and consent to participate
: All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The parents or legal guardians of all recruited children in the study signed an informed consent.
: All authors consent for publication of above manuscript.
: The authors declare that they have no competing interests.