Received: 20 March 2019
Accepted: 6 November 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of the faculty of Medicine, Zagazig University. The reference number is 3836/21-6-2017. The purpose of the study was explained, and an informed written consent was taken before taking any data or doing any investigations. The participants were informed that their participation was voluntary and that they could withdraw from the study at any time without consequences.
: Is not applicable in this section.
: The authors declare that they have no competing interests.