Funding for this research was provided by:
National Cancer Institute (#R03CA117318-02)
Received: 12 October 2018
Accepted: 7 March 2019
First Online: 2 April 2019
Ethics approval and consent to participate
: Participating volunteers signed informed consent agreements to have an extra tube of blood drawn for the study during the routine pre-operative blood draw the day before scheduled surgeries of various types. Use of human subjects was approved by Kaiser Permanente Northern California (KPNC) Institutional Review Board and the University of California, Berkeley (UCB) Committee for the Protection of Human Subjects.
: Not applicable.
: The authors declare that they have no competing interests.
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