Text and Data Mining valid from 2018-01-13
Received: 15 October 2017
Accepted: 20 December 2017
First Online: 13 January 2018
Compliance with ethical standards
: The authors declared that there was no conflict of interest.
: The study protocol was approved by the Research and Ethics Committee of the Faculty of Medicine, Suez Canal University, and all participants signed written informed consents. The researchers followed the ethical standards laid down by the Declaration of Helsinki (1964) and its amendments.