References
- Onda T, Kitagawa M, Takeda O, Sago H, Kubonoya K., Iinuma K, et al. Triple marker screening in native Japanese women. Prenat Diagn 1996; 16: 713–17
- Wald N J, Watt H C, Hackshaw A K. Integrated screening for Down's syndrome based on tests performed during the first and second trimesters. N Engl J Med 1999; 341: 461–7
- de Graaf I M, Pajkrt E, Bilardo C M, Leschot N J, Cuckle H S, van Lith J M. Early pregnancy screening for fetal aneu-ploidy with serum markers and nuchal translucency. Prenat Diagn 1999; 19: 458–62