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Epidemiologic classification of human papillomavirus types associated with cervical cancer .9 .乔友林.中国妇女人乳头瘤病毒感染和子宫颈癌的流行病学研究现状及其疫苗预防前景.中华流行病学杂志， 2007 ， 28.A multi-center survey of age of sexual debut and sexual behavior in Chinese women ： suggestions for o ......