Received: 23 June 2019
Accepted: 31 July 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This was granted by the Internal Review Board of the American University in Cairo for this study, reference number #2015-2016-199. All participants gave written consent to participate.
: This was obtained in writing from all participants.
: The authors declare that they have no competing interests.