Received: 3 October 2018
Accepted: 4 June 2019
First Online: 25 June 2019
Ethics approval and consent to participate
: Students participated voluntarily after official invitation. Written informed consent was obtained from each participant. Participants were assured that test results were confidential and did not constitute a part of their formal assessment. GPAs were calculated according to student identification numbers and were anonymous. This study was approved by ethical board of Kermanshah University of Medical Sciences (IR.kums.rec.1396.3).
: Not applicable.
: The authors declare that they have no competing interests.