| Avtor/Urednik | Tul, N; Spencer, K; Nicolaides, KN | |
| Naslov | Screening for trisomy 18 and 13 by combination of ultrasound and biochemical markers in the 1st trimester | |
| Tip | članek | |
| Vir | Ultrasound Obstet Gynecol | |
| Vol. in št. | Letnik 12, št. Suppl 1 | |
| Leto izdaje | 1998 | |
| Obseg | str. 142 | |
| Jezik | eng |