Received: 17 August 2019
Accepted: 23 September 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Faculty of Medicine at Tanta University in Egypt in April 2016; reference number of approval: 30897/04/16. All parents or guardians of the patients included in this study gave written informed consent to participate in this research.
: All parents or guardians of the patients included in this research gave written informed consent to publish the data contained within this study. The authors grant the publisher the consent for publication of this work.
: The authors declare that they have no competing interests.