Received: 9 September 2019
Accepted: 12 April 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Data were collected after obtaining written informed consent from all of the participants. While each cohort center received the ethical approval from local universities, for the purpose of this study and pooling all PERSIAN site data, the ethics committee of Kermanshah University of Medical Sciences approved the study (IR.KUMS.REC.1397.187).
: Not applicable.
: There is no conflict of interest to be declared.