共 9 条
[3]
DUNN S, 1996, HOSP EPISODE STAT 19
[4]
GRAY DT, 1995, LANCET, V345, P1139, DOI 10.1016/S0140-6736(95)90977-X
[5]
LING FW, 1994, ADV OBSTET GYNAECOLO, P55
[6]
Smith SK, 1996, BRIT MED J, V312, P592
[8]
TAIT RL, 1884, BRIT MED J, V1, P1250