Article History
Received: 19 June 2020
Accepted: 5 April 2021
First Online: 17 April 2021
Declarations
:
: The study was approved by Ethics Committee of Shahid Chamran University of Ahvaz (Ethics statement No 63/21/8/90). Volunteers will be asked to read, accept and sign an informed consent form before any information was collected. Written consent was obtained from the parents for sampling children.
: Not applicable.
: The authors declare that they have no competing interests.