共 25 条
[1]
*AM COLL OBST GYN, 1997, ACOG ED B, V240
[2]
[Anonymous], MMWR MORB MORTAL WKL
[5]
Curtis KM, 1997, AM J EPIDEMIOL, V146, P32, DOI 10.1093/oxfordjournals.aje.a009189
[8]
*DEP HHS, DHHS PUBL, pR5
[9]
Department of Health and Human Services USA, 1994, PREV TOB US YOUNG PE
[10]
DIFRANZA JR, 1995, J FAM PRACTICE, V40, P385