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Article History

First Online: 31 March 2017

Compliance with Ethical Standards

:

: The authors declare that they have no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

: No funding was received; the authors used the equipment of Mansoura University Hospital.

: Informed consent was taken from each patient. The research protocol was approved by the Ethical Committee of the Faculty of Medicine, Mansoura University.

: The manuscript has not been published elsewhere and has not been submitted simultaneously for publication elsewhere.