共 12 条
- [1] ASCARELLI MH, 1989, J REPROD MED, V34, P850
- [2] *CDCP, 1995, MON VITAL STAT REP, V43, P6
- [4] CUNNINGHAM FG, 2005, WILLIAMS OBSTERICS, P254
- [5] DEOTT D, 1891, ANN GYNECOL OBSTET, V36, P304
- [8] Goldner T E, 1993, MMWR CDC Surveill Summ, V42, P73
- [9] Lyons EA, 1998, DIAGNOSTIC ULTRASOUN, P998
- [10] NEUMAN WL, 1990, OBSTET GYNECOL, V75, P479