共 16 条
- [11] NYBERG DA, 1987, J ULTRAS MED, V6, P23
- [12] ROSEN GF, 1990, FERTIL STERIL, V54, P260
- [13] SCHATS R, 1990, BRIT J OBSTET GYNAEC, V97, P998
- [16] LOW FETAL LOSS RATES AFTER ULTRASOUND-PROVED VIABILITY IN EARLY-PREGNANCY [J]. JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 1987, 258 (18): : 2555 - 2557