Funding for this research was provided by:
National Cancer Institute (R01CA141661)
The Food and Drug Administration (P50CA180890, U54HL147127)
Received: 21 May 2019
Accepted: 24 December 2019
First Online: 23 January 2020
Ethics approval and consent to participate
: All participants provided written (in-person interviews) or verbal (phone interviews) informed consent. The study protocol has been reviewed and approved by the Institutional Review Board of the University of California, San Francisco.
: Not applicable.
: The authors declare that they have no competing interests.