共 7 条
[1]
Assessment of fetal anatomy at 12 to 13 weeks of gestation by transabdominal and transvaginal sonography
[J].
BRITISH JOURNAL OF OBSTETRICS AND GYNAECOLOGY,
1996, 103 (01)
:82-85
[4]
ROTTEM S, 1993, ULTRASOUND OBST GYN, P813
[5]
TIMORTRITSCH IE, 1994, DIAGNOSTIC ULTRASOUN, P353
[6]
TIMORTRITSCH IE, 1991, TRANSVAGINAL SONOGRA, P225