共 11 条
[3]
Brown SarahS., 1995, The best intentions: Unintended pregnancy and the well-being of children and families
[4]
Linder FE, 1943, VITAL STAT RATIOS US
[6]
*NAT CTR HLTH STAT, 1967, VIT STAT US A, V2
[7]
*NAT CTR HLTH STAT, 1998, DHHS PUBL S, V46
[8]
*NAT CTR HLTH STAT, 1998, DHHS PUBL
[9]
*NTL CTR CHRON DIS, 1998, MMWR-MORBID MORTAL W, V47, P705
[10]
*PHS, 1991, DHHS PUBL