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Article History

Received: 3 August 2017

Accepted: 29 June 2018

First Online: 5 July 2018

Ethics approval and consent to participate

: The current study was approved by the Ethical Committee of Tehran University of Medical Sciences, Tehran, Iran. Informed written consent was obtained from all participants before being involved in the study. All participants signed an informed consent and received a complete copy of the signed consent form.

: Not applicable (no individual person’s data).

: The authors declare that they have no competing interests.

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