Galal, Sherif
Article History
Received: 29 August 2017
Accepted: 20 May 2018
First Online: 24 May 2018
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.