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The common practice of double-booking a lead surgeon's time and letting junior physicians supervise and complete some parts of a surgery is safe for most patients, a study of more than 60,000 operations finds. But there may be a small added risk for a subset of patients. Ian Lishman/Getty Images hide caption

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Ian Lishman/Getty Images

Researchers find that more than 40 percent of surgical complications happen after patients leave the hospital. hide caption

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