Published Online: November 18, 2013. doi:10.1001/jamainternmed.2013.12217.
Study concept and design: Sipahi.
Acquisition of data: Sipahi.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Sipahi.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Sipahi.
Administrative, technical, or material support: Sipahi.
Study supervision: Tozun.
Conflict of Interest Disclosures: None reported.