Funding for this research was provided by:
Received: 11 September 2020
Accepted: 20 April 2021
First Online: 3 May 2021
: The Stanford IRB designated this study as “Not human subjects research” and therefore exempt from review; this was due to the study being limited to previously-existing coded data and specimens.
: Not applicable – this manuscript does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.