Received: 30 June 2019
Accepted: 24 July 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: The study was approved by the Kasr Al Ainy Ethical Committee. The ethical committee exempted the study from a specific consent, being a retrospective analytic study that reveals no identifiable personal or private information.
: Not applicable
: The authors declare that they have no competing interests.