共 26 条
[1]
ALPER MM, 1985, OBSTET GYNECOL, V65, P781
[3]
BALSDON MJ, 1981, LANCET, V1, P1112
[8]
FREDRICSSON B, 1986, ZBL GYNAKOL, V108, P799
[10]
HEISTERBERG L, 1984, J PERINAT MED, V12, P43