Funding for this research was provided by:
National Institutes of Health (U54CA143931)
Received: 23 January 2019
Accepted: 25 April 2019
First Online: 17 May 2019
Ethics approval and consent to participate
: The need for ethics approval was deemed unnecessary by the University of California Los Angeles Institutional Review Board because the project does not involve “human subjects” as defined in the federal regulations. Human subjects are defined in the federal regulations [45 CFR 46.102(f)] as “living individual(s) about whom an investigator conducting research obtains (1) data through intervention or interaction with the individual, or (2) identifiable private information.” No informed consent was obtained because the project does not involve “human subjects” as defined in the federal regulations [45 CFR 46.102(f)].
: Not applicable.
: Annette Maxwell, Rhonda Santifer, Cindy Chang, Juana Gatson, Catherine Crespi and Aziza Lucas-Wright declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.