1. Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE
2. Robert D. and Patricia E. Kern Center for the Science of Health Care Delivery
3. Department of Nursing, Mayo Clinic, Rochester, MN
4. Division of Health Care Delivery and Research, Mayo Clinic, Rochester, MN
5. Occupational Safety, Systems Quality Office, Mayo Clinic, Rochester, MN, USA
6. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN