Funding for this research was provided by:
California Breast Cancer Research Program (22UB-2309)
Received: 30 November 2020
Accepted: 15 March 2021
First Online: 6 April 2021
: All women provided consent forms when they donated biological samples. The study protocol was approved by the Institutional Review Boards of each participating study site.
: Not applicable
: The authors declare that they have no competing interests.