Funding for this research was provided by:
National Cancer Institute (R01 CA125231)
Received: 8 July 2015
Accepted: 23 November 2015
First Online: 5 December 2015
Compliance with ethical standards
: The content is solely the responsibility of the authors and does not necessarily represent the official views of NIH, NCI, FHCRC, HICOR, NPAIHB, University of Illinois-Chicago, Seattle Cancer Care Alliance, or the University of Washington. The authors have full access to all primary data. Given the ethical standards and protocols with this vulnerable population, primary data may be shared upon approval by the Portland Area Indian Health Service Institutional Review Board and the Northwest Portland Area Indian Health Board.
: This work was supported by grants from the National Institutes of Health (NIH), National Cancer Institute (NCI) (R01 CA125231 to S. Ramsey).
: The authors declare that they have no competing interests.