Article History
Received: 27 November 2019
Accepted: 30 January 2020
First Online: 5 February 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflicts of interest.
: The study was approved by the local Ethics Committee of Medical Research of the Faculty of Medicine, South Valley University, Qena, Egypt and was conducted in accordance with the Declaration of Helsinki. Informed written consent was obtained from every participant’s parents.