References
- Waldenstrom U, Axelsson O, Nilsson S. A comparison of the ability of a sonographically measured biparietal diameter and the last menstrual period to predict the spontaneous onset of labor. Obstet Gynecol 1990; 76: 336
- Saari-Kemppainen A, Karjalainen O, Ylostalo P, Heinonen OP. Ultrasound screening and perinatal mortality: controlled trial of systematic one-stage screening in pregnancy. Lancet 1990; 336: 387–91
- Campbell S, Warsof SL, Little D, Cooper DJ. Routine ultrasound screening for the prediction of gestational age. Obstet Gynecol 1985; 65: 613
- Waldenström U, Axelsson O, Nilsson S. Effects of routine one-stage ultrasoundscreening in pregnancy: A randomised controlled trial. Lancet 1988; ii: 585–8
- Persson P-H, Weldner B-M. Reliability of ultrasound feto-metry in estimating gestational age in the second trimester. Acta Obstet Gynecol Scand 1986; 65: 481–3
- Grennert L, Persson P-H, Gennser G. Benefits of ultrasonic screening of a pregnant population. Acta Obstet Gynecol Scand (Suppl) 1978; 78: 5–14
- Persson P-H, Weldner B-M. Normal range curves for fetal biparietal diameter, occipito-frontal diameter, mean abdominal diameters and femur length. Acta Obstet Gynecol Scand (Suppl) 1986; 65: 759–61
- Waldenström U, Axelsson O, Nilsson S. Sonographic dating of pregnancies among women with menstrual irregularities. Acta Obstet Gynecol Scand 1991; 70: 17–20
- Belfrage P, Fernstrom I, Hallenberg G. Routine or selective ultrasound examinations in early pregnancy. Obstet Gynecol 1987; 69: 747–50