Experimental and nonexperimental studies: methodological, ethical, and practical implications in the context of hepatobiliary tumors.
Mariani
L
L
Division of Medical Statistics and Biometry, Istituto Nazionale Tumori, Milan, Italy.
D001650:Bile Duct Neoplasms / Q000628:therapy*; D001653:Bile Ducts, Intrahepatic; D002986:Clinical Trials as Topic; D004992:Ethics, Medical; D006801:Humans; D008113:Liver Neoplasms / Q000628:therapy*; D016032:Randomized Controlled Trials as Topic; D012107:Research Design