1. Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
2. Department of Epidemiology and Prevention, Wake Forest University School of Medicine, Winston-Salem, NC, USA
3. Department of Neurology, Mayo Clinic, Jacksonville, FL, USA
4. Department of Neurology, Mayo Clinic, Rochester, MN, USA
5. Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA