Received: 31 December 2019
Accepted: 23 September 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: The study protocol was approved by the institutional review boards at all sites (the Centers for Disease Control and Prevention, Abt Associate, Open Medicine Institute Consortium, Mount.Sinai Beth Israel, and Nova Southeastern University). All participants provided informed consent via paper-based or web-based copy prior to their participation in the study.
: Not applicable.
: The authors declare that they have no competing interests.