Foetal sex determination in maternal blood from the seventh week of gestation and its role in diagnosing haemophilia in the foetuses of female carriers

1. Bustamante-Aragones, A.
2. Rodriguez De Alba, M.
3. Gonzalez-Gonzalez, C.
4. Trujillo-Tiebas, M.J.
5. Diego-Alvarez, D.
6. Vallespin, E.
7. Plaza, J.
8. Ayuso, C.
9. Ramos, C.