DePalma Michael J, Beall Douglas P, Frey Michael E, Kallmes David F, Prather Heidi
VCU Spine Center, Interventional Spine Care Fellowship, Virginia Commonwealth University/Medical College of Virginia Hospitals, Richmond, VA, USA.
PM R. 2010 Sep;2(9):862-7. doi: 10.1016/j.pmrj.2010.08.005.