Received: 7 September 2018
Accepted: 22 April 2019
First Online: 15 May 2019
Ethics approval and consent to participate
: A written consent was taken from all of the participants after explaining the details, benefits, as well as risks to them. The study was approved from the institutional ethics committee of <i>Faculty of medicine, Assiut University</i> under the number of (R0165N2016) at 16th of June, 2016.
: Not applicable in this section.
: The authors declare that they have no competing interests.
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