Hospitals are trying to make it safer for patients to go under the knife.

Surgery can be risky by its very nature, and the possibility of error or negligence makes it even more so. According to an analysis last year in the journal Patient Safety in Surgery, 46% to 65% of adverse events in hospitals are related to surgery, especially complex procedures. Despite years of prevention efforts, procedures are still performed on the wrong body part and surgical tools are sewn up in patients.

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