Changing gloves and switching instruments to decrease surgical site infection in abdominal surgery

[...]the study was obviously not masked, and it is likely that the Hawthorne effect was more pronounced in the intervention sites compared with the control sites. [...]some of the missing outcomes necessitating a modified intention-to-treat analysis could have led to additional selection bias and residual confounding. [...]interventions are probably cost-effective, and we look forward to the authors' follow-up data on cost-effectiveness.