共 7 条
[3]
LOGAN WPD, 1953, LANCET, V2, P1199
[4]
WINGO PA, 1991, OBSTET GYNECOL, V78, P161
[5]
1993, LANCET, V341, P25
[6]
1993, LANCET, V341, P33
[7]
1993, LANCET, V341, P502