Accepted for Publication: February 16, 2015.
Published Online: April 13, 2015. doi:10.1001/jamainternmed.2015.0753.
Study concept and design: Horn, Bishop, Klam, Doan.
Acquisition, analysis, or interpretation of data: Gilman, Cage, Horn, Doan.
Drafting of the manuscript: Gilman, Horn, Klam, Doan.
Critical revision of the manuscript for important intellectual content: Cage, Bishop, Klam, Doan.
Administrative, technical, or material support: Gilman, Cage, Horn, Klam, Doan.
Study supervision: Cage, Klam, Doan.
Conflict of Interest Disclosures: None reported.
Disclaimer: The views expressed in this article are those of the author(s) and do not necessarily reflect the official policy or position of the US Department of the Navy, US Department of Defense, or the US government.
Additional Contributions: James A. Cooper, MD, at Imaging Healthcare Specialists, San Diego, California, provided the magnetic resonance images and interpreted the magnetic resonance imaging results.