Received: 24 May 2019
Accepted: 1 August 2019
First Online: 16 September 2019
Ethics approval and consent to participate
: This study was approved by the research ethical committee (REC) of Faculty of Medicine, Ain Shams University August 10, 2012, and informed consent was obtained from all patients prior to their inclusion in the study.
: This manuscript did not contain any individual person’s data.
: All authors declare that they have no competing interests.