Correspondence: Evan M. Renz, MD, US Army Institute of Surgical Research, 3400 Rawley E. Chambers Dr, Fort Sam Houston, TX 78234 (evan.renz@us.army.mil).
Accepted for Publication: June 27, 2011.
Author Contributions: Study concept and design: Renz and Ling. Acquisition of data: Ling, Mork, and Ecklund. Analysis and interpretation of data: Ling and Ecklund. Drafting of the manuscript: Renz. Critical revision of the manuscript for important intellectual content: Renz, Ling, Mork, and Ecklund. Administrative, technical, and material support: Renz and Ling. Study supervision: Renz.
Financial Disclosure: None reported.