Received: 10 July 2019
Accepted: 9 August 2019
First Online: 17 September 2019
Ethics approval and consent to participate
: The study was approved by the Ethical Research Committee of the Faculty of Medicine, Tanta University. An informed consent was obtained from all participants to be included in this study.
: Each of the participants was given a code number, and his anonymity was preserved (his individual person’s data was omitted and not included in the submitted manuscript).
: The authors declare that they have no competing interests.