Received: 30 July 2019
Accepted: 11 March 2020
First Online: 31 March 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Faculty of Medicine at Cairo University in Egypt on June 2015; reference number of approval: I-080315 and consent to participate is not applicable, as this paper was retrospective.
: Not applicable.
: The authors declare that they have no competing interests.