Article History
Received: 9 January 2020
Accepted: 1 June 2020
First Online: 10 June 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee in the research of Shahid Beheshti University of Medical Sciences (IR.SBMU.PHNM.1395.710). The research objectives and the confidentiality of information were explained for all study units, and all of them verbally declared their consent. A waiver of written consent was provided by the Ethics Committee in order to increase anonymity and better answering.
: Not Applicable.
: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.