Received: 31 August 2019
Accepted: 22 June 2020
First Online: 27 June 2020
Ethics approval and consent to participate
: All parents or legal guardians of the participants signed a written informed consent. The ethical issues of this study were approved by the Ethical Committee of National Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences (code: ir.sbmu.nnftri.rec.1396.170).
: Not applicable.
: The authors declare that they have no competing interests.