共 24 条
[2]
ALEXANDER GR, 1985, PUBLIC HEALTH REP, V100, P539
[3]
ANDERSEN HF, 1981, AM J OBSTET GYNECOL, V139, P173
[6]
BURNHAM D, 1983, MONTHLY VITAL STAT S, V32
[7]
CATES W JR, 1980, Journal of Adolescent Health Care, V1, P18, DOI 10.1016/S0197-0070(80)80004-0
[8]
*CTR DIS CONTR, 1983, AB SURV 1979 1980