Received: 19 November 2020
Accepted: 29 January 2021
First Online: 22 February 2021
Ethics approval and consent to participate
: This study was approved by the Institutional Review Boards for the University of California at San Francisco and Kaiser Permanente Northern California. Written informed consent was obtained from all participants. The study protocol and methods were performed in accordance with the guidelines and regulations of the Declaration of Helsinki.
: Not applicable.
: No authors report competing interests.