Funding for this research was provided by:
Mashhad University of Medical Sciences
Received: 24 May 2020
Accepted: 22 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: This study was approved by the ethical committee of Mashhad University of Medical Sciences (Number: IR.MUMS.REC.1397.306). The informed consent was not required to be obtained due to the nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.