共 7 条
[1]
BENIRSCHKE K, 1961, OBSTET GYNECOL, V18, P309
[3]
ELLIOTT PM, 1961, LANCET, V2, P835
[4]
Gadd R L, 1966, J Obstet Gynaecol Br Commonw, V73, P11, DOI 10.1111/j.1471-0528.1966.tb05114.x
[5]
KOSSOFF G, 1974, AUSTRALAS RADIOL, V18, P62
[6]
TINDALL V R, 1965, J Obstet Gynaecol Br Commonw, V72, P356
[7]
Winsberg F., 1973, J CLIN ULTRASOUND, V1, P52, DOI [10.1002/jcu.1870010111, DOI 10.1002/JCU.1870010111]