Funding for this research was provided by:
Mashhad University of Medical Sciences (970733)
Received: 18 December 2019
Accepted: 13 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: This study was approved by the ethical committee of Mashhad University of Medical Sciences (number: 970733(. Inform consent was not obtained due to the nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.