A.D.A.M. Health Solutions Editorial Team, Ebix, Inc.: David Zieve, MD, MHA, and David R. Eltz. Previously reviewed by Luc Jasmin, MD, PhD, Department of Neurosurgery at Cedars-Sinai Medical Center, Los Angeles, and Department of Anatomy at UCSF, San Francisco, CA. Review provided by VeriMed Healthcare Network (9/26/2011).
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