Published Online: July 29, 2013. doi:10.1001/jamainternmed.2013.8211.
Study concept and design: Fogarty, Sturrock.
Acquisition of data: Premji.
Analysis and interpretation of data: Fogarty, Prinsloo.
Drafting of the manuscript: Fogarty.
Critical revision of the manuscript for important intellectual content: Sturrock, Premji, Prinsloo.
Statistical analysis: Fogarty.
Administrative, technical, and material support: Sturrock, Premji, Prinsloo.
Conflicts of Interest Disclosures: None reported.
Additional Information: This work was initiated in collaboration with Tony Hitch, PhD, who sadly died in April 2012.