目的 对已发表的文献进行Meta分析,评价服用阿司匹林对结直肠腺瘤的化学预防.方法 采用Cochrane系统评价方法,检索PubMed、EMBase......

The risk of colorectal cancer for any patient with ulcer-ative colitis is known to be elevated, and is estimated to be 2......