1. Institute for Health Research, Kaiser Permanente Colorado, Aurora, CO, USA.
2. Center for Complementary Medicine, Kaiser Permanente Colorado, Aurora, CO, USA.
3. Department of Chemical Dependency, Kaiser Permanente Colorado, Aurora, CO, USA.
4. Department of Medicine, University of Colorado, Aurora, CO, USA.
5. Urgent Care, Colorado Permanente Medical Group, Denver, CO, USA.
6. Colorado Permanente Medical Group, Denver, CO, USA.
7. Division of General Internal Medicine, University of Colorado School of Medicine, Aurora, CO, USA.