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• Bahli did a systematic literature review in 2009 and found that 'no significant difference in the incidence of postoperative wound infection was observed between masks groups and groups operated with no masks.'

• Surgeons at the Karolinska Institute in Sweden, recognizing the lack of evidence supporting the use of masks, ceased requiring them in 2010 for anesthesiologists and other non-scrubbed personnel in the operating room. 'Our decision to no longer require routine surgical masks for personnel not scrubbed for surgery is a departure from common practice. But the evidence to support this practice does not exist,' wrote Dr. Eva Sellden.

• Webster et al., in 2010, reported on obstetric, gynecological, general, orthopaedic, breast and urological surgeries performed on 827 patients. All non-scrubbed staff wore masks in half the surgeries, and none of the non-scrubbed staff wore masks in half the surgeries. Surgical site infections occurred in 11.5% of the Mask group, and in only 9.0% of the No Mask group.

• Lipp and Edwards reviewed the surgical literature in 2014 and found 'no statistically significant difference in infection rates between the masked and unmasked group in any of the trials.' Vincent and Edwards updated this review in 2016 and the conclusion was the same.

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