Learning Curve in Ultrasonographic Screening for Selected Fetal Structural Anomalies in Early PregnancyTaipale, Pekka; Ämmälä, Martti; Salonen, Riitta; Hiilesmaa, Vilho · Obstetrics & Gynecology · 2003

Two-stage ultrasonography in screening for fetal anomalies at 13–14 and 18–22 weeks of gestationPekka Taipale; Martti Ämmälä; Riitta Salonen; Vilho Hiilesmaa · 2004

Two-stage ultrasonography in screening for fetal anomalies at 13-14 and 18-22 weeks of gestationTaipale, Pekka; Ämmälä, Martti; Salonen, Riitta; Hiilesmaa, Vilho · Acta Obstetricia et Gynecologica Scandinavica · 2004