Article History
Received: 20 September 2019
Revised: 14 December 2019
Accepted: 27 December 2019
First Online: 13 January 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This study received exemption through the University of Washington IRB, Human Subjects Committee D (STUDY00006752). All procedures performed involving human participants were in accordance with the ethical standards of the University of Washington and each participating tribal clinic, and with the 1964 Helsinki declaration and its later amendments and comparable ethical standards.