1. Department of Family Medicine and Mayo Clinic, Rochester, Minnesota, USA.
2. Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota, USA.
3. Department of Family Medicine, Mayo Clinic, Mankato, Minnesota, USA.
4. Department of Family Medicine, Mayo Clinic, Lake City, Minnesota, USA.
5. Primary Care and Population Health, Mayo Clinic, Rochester, Minnesota, USA.
6. Department of Physical Medicine and Rehabilitation, Spine Center, Mayo Clinic, Rochester, Minnesota, USA.
7. Department of Family Medicine, Mayo Clinic, Menomonie, Wisconsin, USA.