Funding for this research was provided by:
Tehran university of medical sciences (127334-26145-188-02-93)
Text and Data Mining valid from 2019-08-06
Received: 24 October 2018
Accepted: 23 July 2019
First Online: 6 August 2019
Ethics approval and consent to participate
: Since the data collection process was conducted using phone interviews, we obtained oral instead written informed consent from all of the participants. In the case of less than 16 years old participants, the oral informed consent was obtained from one of their parents. The study as well as its verbal consent was approved by the ethics committee of Tehran University of Medical Sciences (approval number: 127334–26145–188-02-93).
: Not applicable.
: The authors declare that they have no competing interests.