Routine Aspirin or Nonsteroidal Anti-inflammatory Drugs for the Primary Prevention of Colorectal Cancer: U.S. Preventive Services Task Force Recommendation Statement -- U.S. Preventive Services Task Force* 146 (5): 361 -- Annals of Internal Medicine

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Appendix Table 2. U.S. Preventive Services Task Force Grades for Strength of Overall Evidence* ${webonly}$

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