Funding for this research was provided by:
Kermanshah University of Medical Sciences (700534)
Received: 26 October 2019
Accepted: 28 May 2020
First Online: 5 June 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).
: The authors declare no conflict of interest.