共 17 条
[1]
ANSARI I, 1970, Journal of Obstetrics and Gynaecology of the British Commonwealth, V77, P713
[2]
CHESLEY LC, 1972, J OBSTET GYNAECOL BR, V78, P406
[7]
DRUMMOND GB, 1974, BR MED J, V1, P587
[10]
KERR MG, 1964, BRIT MED J, V1, P532