Received: 28 January 2020
Accepted: 5 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: Ethical clearance was obtained from the Institutional Review Board (IRB) at AUBMC (PED.GD.11). The need for consent was waived by our IRB for this study since we were reviewing medical records retrospectively and all data collected were stripped of patient identifiers. Only subjects who had been enrolled prospectively in the surveillance studies mentioned had consents already signed before enrollment.
: Not applicable.
: The authors declare that they have no competing interests