The number of surgeries performed worldwide has grown steadily, particularly in the developing world, yet there remains an enormous gap in surgical care between rich and poor nations, according to a new study led by a Stanford University School of Medicine researcher.

Between 2004 and 2012, the estimated annual number of operations around the globe rose 38 percent, from about 224 million to nearly 313 million, the researchers found. The biggest increase, 114 percent, occurred in relatively poor countries.

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