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註釋This text introduces the student to epidemiology, providing a guide through questions and answers surrounding the dynamics of well-planned and interpreted research, grant reviews and critical appraisal. This edition includes information on AIDS, helicobacterpylori infection, breast and colon cancer screening, and gastric and peptic ulcers. Research aimed at answering questions such as diagnosis, prognosis and treatment is examined, and the text also looks at how the results of such research can be protected from distortion by bias and chance. Each chapter contains a summary and suggested readings.