Received: 5 August 2020
Accepted: 25 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: The institutional review board approved this study (approval number 20-R057) and waived the requirement for informed consent in view of the retrospective study design and the urgent need for research insights into this growing pandemic.
: Not applicable.
: The authors declare that they have no competing interests.