Submitted for Publication: September 6, 2013; accepted October 17, 2013.
Published Online: December 12, 2013. doi:10.1001/jamaoto.2013.5996.
Study concept and design: Ponnappan, Campana.
Acquisition of data: Ponnappan.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Ponnappan, Ramakrishnan.
Obtained funding: None listed.
Administrative, technical, or material support: Beckmann, Ponnappan, Campana.
Study supervision: Campana, Ramakrishnan.
Conflict of Interest Disclosures: None reported.
Additional Contributions: We thank Robert Ketchum, PhD, and Richard Maxwell, Porter Adventist Hospital medical librarian, for their assistance.