共 5 条
- [1] [Anonymous], 1993, Lancet, V342, P1517
- [2] [Anonymous], 1992, ONLINE J CURR CLIN T, DOI DOI 10.1097/00006254-199404000-00008
- [3] KLEIN MC, 1995, CAN MED ASSOC J, V153, P769
- [4] Thacker S B, 1983, Obstet Gynecol Surv, V38, P322, DOI 10.1097/00006254-198306000-00003
- [5] Woolley R J, 1995, Obstet Gynecol Surv, V50, P806, DOI 10.1097/00006254-199511000-00020