共 19 条
[2]
FARRELL SJ, 1980, OBSTET GYNECOL, V56, P696
[3]
FISK NM, 1987, AUS BR J OBSTET GYNE, V12, P1159
[4]
GASSNER CB, 1976, AM J OBSTET GYNECOL, V126, P22
[8]
MORO M, 1974, OBSTET GYNECOL, V44, P688
[9]
NIELSEN T, 1984, THESIS U GOTEBORG SW
[10]
OTT WJ, 1981, OBSTET GYNECOL, V57, P171