Received: 4 February 2019
Accepted: 31 August 2019
First Online: 14 September 2019
Compliance with ethical standards
: There is no conflict of interest to report for this study.
: The study protocol was registered and ethically approved by the research council of Shahid Sadoughi University of Medical Sciences (registration code: IR.SSU.SPH.REC.1397.059).
: The informed consent was not applicable for the current study.