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Acta Obstetricia et Gynecologica Scandinavica > 103 > 5 > 897 - 906
Journal of Clinical Ultrasound > 50 > 7 > 984 - 988
Journal of Clinical Ultrasound > 50 > 7 > 989 - 1003
Ultrasound in Obstetrics & Gynecology > 58 > 1 > 11 - 18