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2. Sonar biparietal diameter
3. Percentile ranks of sonar fetal abdominal circumference measurements
4. , , et al: Assessment of gestational age by ultrasonographic measurement of the femur length. Acta Obstet Scand (in press).
5. : Epidemiology of chronic congenital and perinatal infection of man, in (guest editors): Symposium on Perinatal Infections, Clinics in Perinatology (Vol. 8). Philadelphia, W.B. Saunders Co., 1981, p 397.