共 11 条
[1]
American College of Obstetricians and Gynecologists, 1998, ACOG PRACTICE PATTER, P1
[2]
DEPP R, 1996, OBSTETRICS NORMAL PR, P606
[4]
DUNNIHOO DR, 1989, OBSTET GYNECOL, V73, P390
[8]
SCOTT JR, 1991, OBSTET GYNECOL, V77, P811