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据AmJGastroenterol(1999,94:149)载,美国Khan等报告了在美国一家医院进行的有关胆道系统癌症危险因素的病例对照研究结果。人们对胆道系统癌症如胆囊癌和肝外胆管癌的危险因素知之甚少,为此Khan等做了有关这类癌症危险因素的病例对照?
According to AmJ Gastroenterol (1999, 94: 149), Khan et al. reported results of a case-control study of risk factors for biliary system cancer in a U.S. hospital. Little is known about the risk factors for biliary system cancers such as gallbladder cancer and extrahepatic cholangiocarcinoma. For this reason, Khan et al. did a case-control of these cancer risk factors?