Funding for this research was provided by:
Kermanshah University of Medical Sciences
Received: 18 September 2019
Accepted: 5 February 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: While each cohort center received the ethical approval from local universities, for the purpose of this study and pooling all PERSIAN data, the ethics committee of Kermanshah University of Medical Sciences approved the study (IR.KUMS.REC.1397.187).
: Not applicable.
: The authors declare no conflict of interest.