1. Department of Anesthesiology and Perioperative Medicine, Mayo Clinic Hospital , Rochester, MN 55905, United States
2. Department of Physical Medicine and Rehabilitation, Mayo Clinic Hospital , Rochester, MN 55905, United States
3. Department of Anesthesiology, University of Wisconsin , Madison, WI 53706, United States
4. Mayo Clinic Libraries , Rochester, MN 55905, United States