Funding for this research was provided by:
National Center for Complementary and Integrative Health (1U19AT007912-01)
National Chiropractic Mutual Insurance Company (NCMIC) Foundation (NA)
Received: 4 March 2020
Accepted: 5 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: The project was approved by the Human Subjects Protection Committee at the RAND Corporation and all participants gave written consent.
: Not applicable.
: The authors declare that they have no competing interests.