Received: 26 September 2019
Accepted: 23 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: Informed written consent was obtained from the participants or their parents, in term of children. The study was approved by the Ethics Committee of the Jiroft University of Medical Sciences. Confidentiality of the details of the participants was assured.
: Not applicable.
: The authors declare that they have no competing interests.