共 12 条
[2]
Cheng YM, 1997, CONTRACEPTION, V55, P15
[3]
Public knowledge and perceptions about unplanned pregnancy and contraception in three countries
[J].
FAMILY PLANNING PERSPECTIVES,
1997, 29 (02)
:70-75
[4]
Delbanco S F, 1998, J Am Med Womens Assoc (1972), V53, P242
[8]
Grimes D, 1998, LANCET, V352, P428
[9]
Unintended pregnancy in the United States
[J].
FAMILY PLANNING PERSPECTIVES,
1998, 30 (01)
:24-+