Received: 16 March 2020
Accepted: 14 April 2020
First Online: 4 June 2020
Ethics approval and consent to participate
: Ethics committee approval obtained from clinical governance office in Dubai health authority. Ref: CGO-29-6-2016. As this was a retrospective study, consent to participate was not required.
: Not applicable.
: The authors have no conflicts of interest to declare.