Funding for this research was provided by:
Tehran University of Medical Sciences and Health Services (96-04-161-37647)
Received: 4 October 2019
Accepted: 20 December 2019
First Online: 2 January 2020
Compliance with ethical standards
: The study protocol was reviewed and approved by ethics committee of vice-chancellor in research affairs, Tehran University of Medical Sciences (ethics code: IR.TUMS.VCR.REC.1397.170). Before undergoing any study procedure, all patients gave written informed consent.
: The authors declare that they have no conflict of interest.