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Article History

Received: 10 April 2018

Accepted: 7 March 2019

First Online: 15 March 2019

Ethics approval and consent to participate

: Ethical approval of the current study was obtained from the Deputy of Research Affairs, The school of Allied Medical Sciences, Tehran University of Medical Sciences. The permission to conduct the research was obtained from the authorities in the study settings. All participants were informed of the aims of the study and their participation was on voluntary basis. Verbal informed consents were secured from each participant since according ethical principles of Iran no written consent is needed for studies including no invasive clinical techniques. As for the confidentiality of the information, the participants were not required to write their names, phone numbers, and their address in the questionnaire. The participants had the right to refuse participation or withdraw from the study.

: Not applicable.

: The authors declare that they have no competing interests.

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