大卫·约翰逊，医学博士

大卫·约翰逊，医学博士，F.A.C.G.，F.A.C.P.，是医学的东弗吉尼亚学校和过去的美国胃肠病学院（ACG）的总裁药品和消化科的首席教授。He co-founded the National Medicare Carrier Advisory Committee, which he co-chaired for 10 years, and since 2000 has served on both the U.S. Multi-Society Task Force on Colorectal Cancer and the ACG guidelines committee for colorectal cancer screening, co-authoring screening guidelines.