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Article History

Received: 3 October 2018

Accepted: 19 March 2019

First Online: 5 April 2019

Ethics approval and consent to participate

: To comply with ethical considerations, the research project was approved by the Ethical Research Committee of Shahid Beheshti University of Medical Sciences under the ethics code IR.SBMU.PHNM.406. The study respected the principles of the ethics committee in charge as well as the 1975/1983 Helsinki declaration.Written informed consent to enter the study was obtained from the participants and was ensured about the confidentiality of their data and their right to withdraw from the study at any time and was ensured that their withdrawal would not affect routine utilization services (a copy of consent form is available as supplementary file).

: All students participating for the present study sign a statement confirming that their data will be used anonymously for research objectives. A copy of the consent form is available for review by the Editor of this journal and has been available as supplementary file.

: The authors declare that they have no competing interests.

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