共 34 条
[1]
[Anonymous], 1981, AM J OBSTET GYNECOL, V141, P276
[5]
CROWLEY P, 1992, OBSTET GYN CLIN N AM, V19, P317
[7]
Dunlop S A, 1997, J Matern Fetal Med, V6, P309
[8]
FRENCH N, 1997, P PERINATAL SOC AUST, V1