Received: 14 March 2020
Accepted: 17 November 2020
First Online: 25 November 2020
Ethics approval and consent to participate
: Ethical approval: This study has been approved and supported as a research project by Environmental and Occupational Hazards Control Research Center in Shahid Beheshti University of Medical Sciences, Tehran, Iran (SBMU.RAM.REC.1394.540). Participants were provided information about the study and verbal consented by proceeding to take the survey; this implied verbal consent was approved by the Ethical Board Committee of Shahid Beheshti University of Medical Sciences.
: Not applicable.
: The authors have no conflicts of interest.