Author Contributions: Dr Urbach had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Lopushinsky, Urbach.
Analysis and interpretation of data: Lopushinsky, Urbach.
Drafting of the manuscript: Lopushinsky, Urbach.
Critical revision of the manuscript for important intellectual content: Lopushinsky, Urbach.
Statistical analysis: Lopushinsky, Urbach.
Obtained funding: Lopushinsky, Urbach.
Administrative, technical, or material support: Urbach.
Study supervision: Urbach.
Financial Disclosures: Dr Urbach reports that he holds a chair that was endowed in part by contributions from Tyco Canada, a manufacturer of surgical devices. No other disclosures were reported.
Funding/Support: This work was supported in part by grants from the Society of American Gastrointestinal Endoscopic Surgeons and the Canadian Association of General Surgeons. Dr Lopushinsky is a Canadian Institutes of Health Research Clinical Research Fellow. Dr Urbach is a Career Scientist of the Ontario Ministry of Health and Long-Term Care, Health Research Personnel Development Program, and Tyco Chair of Minimally Invasive Surgery at the University Health Network.
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; or preparation, review, and approval of the manuscript.
Acknowledgment: We thank Jun Guan, MSc, and Ruth Croxford, MSc, Institute for Clinical Evaluative Sciences, Toronto, Ontario, for expert progamming and data management (Ms Guan) and helpful suggestions regarding the statistical analysis (Ms Croxford).