Accepted for Publication: December 17, 2013.
Published Online: August 13, 2014. doi:10.1001/jamasurg.2014.249.
Study concept and design: Möller, Persson, Thorell.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Möller, Gustafsson, Persson, Thorell.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Möller, Gustafsson, Rasmussen.
Obtained funding: Möller, Thorell.
Administrative, technical, or material support: Möller, Rasmussen, Thorell.
Study supervision: Möller, Persson, Thorell.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by the Erling-Persson Family Foundation and the Regional Agreement on Medical Training and Clinical Research (ALF) between Stockholm County Council and the Karolinska Institutet.
Role of the Sponsor: The funding organizations had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Information: This study is registered at clinicaltrials.gov (identifier: NCT01734720).