1. Department of Gynecologic Surgery, Mayo Clinic Hospital, Phoenix, Arizona.
2. Department of Neurology, Mayo Clinic Hospital, Phoenix, Arizona.
3. Department of Neurology, Carolinas Medical Center, Charlotte, North Carolina.
4. Department of Kinesiology, University of North Carolina—Charlotte, Charlotte, North Carolina.
5. Department of Physical Therapy, Mayo Clinic Hospital, Phoenix, Arizona.
6. Department of Research Biostatistics, Mayo Clinic Hospital, Phoenix, Arizona.