Abdel Razek, Ahmed Abdel Khalek http://orcid.org/0000-0002-9613-5932
Nada, Nadia
Article History
Received: 21 September 2017
Accepted: 22 March 2018
First Online: 27 March 2018
Compliance with ethical standards
:
: Informed consent waived because this is a retrospective study.
: IRB approval was obtained.
: All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: All authors declare they have no conflict of interest.