Funding for this research was provided by:
National Center for Advancing Translational Sciences (UCSF-CTSI Grant Number UL1 TR000004)
Received: 8 November 2019
Accepted: 4 March 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: This retrospective study was reviewed and approved by the Committee on Human Research at UCSF and was carried out in accordance with their ethical standards and regulations.
: Not applicable, as the manuscript does not contain any individual person’s data.
: The authors declare that they have no competing interests.