共 3 条
- [1] HOLDING S, 1992, CLIN CHEM, V38, P2336
- [2] MATERNAL SERUM SCREENING FOR DOWNS-SYNDROME - THE EFFECT OF ROUTINE ULTRASOUND SCAN DETERMINATION OF GESTATIONAL-AGE AND ADJUSTMENT FOR MATERNAL WEIGHT [J]. BRITISH JOURNAL OF OBSTETRICS AND GYNAECOLOGY, 1992, 99 (02): : 144 - 149
- [3] WALD NJ, 1981, LANCET, V1, P1103