Department of Orthopedics and Rehabilitation, University of Iowa Hospital and Clinics, Iowa City, IA (Galvin, Patterson, Bozoghlian, and Nepola), Department of Clinical Investigation, Madigan Army Medical Center, Tacoma, WA (Colburn).

Correspondence to Dr. Galvin: [email protected]

The views expressed are those of the author(s) and do not reflect the official policy of the Department of the Army, the Department of Defense, or the U.S. Government.

Five authors have been approved for this paper by Dr. Peter Rose