Article History
Received: 12 October 2017
Accepted: 28 March 2019
First Online: 16 April 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethical committee in Tanta University, Egypt, under the code number (31277/12/16) on December 2016. Participation was voluntary and all contributors or their first-degree relatives received detailed information about the aims of this research work and an informed consent was obtained prior to the commencement of the study.
: A written informed consent for the publication was obtained from all the participants and their first degree relatives.
: The authors declare that they have no competing interests.
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