共 24 条
[1]
AMARO H, 1989, PEDIATRICS, V84, P144
[3]
Bryan TL, 1999, J REPROD MED, V44, P351
[10]
Contraceptive failure rates: New estimates from the 1995 National Survey of Family Growth
[J].
FAMILY PLANNING PERSPECTIVES,
1999, 31 (02)
:56-63