Text and Data Mining valid from 2019-07-05
Received: 6 September 2018
Accepted: 25 June 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: This case-control study was approved by the ethics committee of the Tehran University of Medical Sciences (Registration No. 146). A written informed consent form (in Persian) obtained from all the participants. Participation was free, and a participant could withdraw at whatever point the person feels he/she was unable to continue. There was no bar to receiving the other health care services of the center. The personal information of participants was kept secret before, during, and after the study.
: Not applicable.
: The authors declare that they have no competing interests.