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di san ci liu xing bing xue ge ming
Author(s): 
Pages: 22
Year: Issue:  1
Journal: Occupational Health and Emergency Rescue

Abstract: <正> 1940年后,流行病学除用于对疾病的传染性病因进行人群研究之外,又渐增加了对非传染病因的研究,包括吸烟、石棉、β-萘胺、氯乙烯、双氯甲醚和辐射的研究,积累了许多宝贵的资料。至1970年前后,公众和学术界对癌的认识发生了改变,从以往认为癌是年龄增大必然伴随的结果,到认为癌是一组与外源性病因有联系的疾病,其中有些外因已被认识,有些尚待识别。1976年Terris提出
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