Background: Colorectal cancer is a common one of gastrointestinal cancer, the incidence of colorectal cancer in North America, Western Europe, the Nordic region and other developed countries higher, usually malignant tumor of the first and second, China's incidence rate of colorectal cancer in The world to see relatively low, ranking the first three cancer, the mortality rate ranked four, but over the past 30 years have marked the rise. Colorectal cancer has become a serious threat to the health of o...
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