共 22 条
[2]
DEVORE G, 1980, AM I ULTRASOUND MED
[3]
ETCHES PC, 1979, PEDIATRICS, V64, P326
[4]
EVRARD JR, 1977, OBSTET GYNECOL, V50, P594
[5]
GARRETT W J, 1975, Journal of Clinical Ultrasound, V3, P45, DOI 10.1002/jcu.1870030109