Article History
Received: 5 June 2020
Accepted: 26 October 2020
First Online: 31 October 2020
Ethics approval and consent to participate
: The study was considered to be exempt from review by the IRB of Mashhad Dental School, since the research was conducted in established educational setting. It complies with national guidelines. The letter of exempt from IRB review is submitted separately. According to national regulations and the IRB of Mashhad Dental School, the participation of students in the study that was conducted in established educational setting was regarded as consent to participate. The participants had an option to opt-out providing they did not consent to participate in the study.
: We declare that the manuscript has been read and approved by all authors, that the requirements for authorship have been met, and that we believe that the manuscript represents honest work.
: The authors declare that there is no conflict of interest regarding the publication of this article.