共 17 条
[3]
CASHNER KA, 1987, OBSTET GYNECOL, V70, P827
[4]
*CTR DIS CONTR, 2009, 2007 ASS REPR TECHN
[5]
CUNNINGHAM FG, 2005, WILLIAMS OBSTET, P70
[7]
Figueras F, 2003, J REPROD MED, V48, P252
[8]
Fong SA, 2005, J SOC GYNECOL INVEST, V12, p102A