共 19 条
[1]
ALGER LS, 1993, OBSTET GYNECOL, V82, P787
[2]
[Anonymous], 1980, STAT METHODS CANC RE
[3]
Armitage P, 1987, Statistical methods in medical research, V2nd
[6]
*CDC, 1992, MMWR-MORBID MORTAL W, V41, P961
[7]
*EUR COLL STUD, 1992, LANCET, V339, P1007
[8]
*EUR COLL STUD, 1994, BRIT J OBSTET GYNAEC, V101, P136
[9]
*IT MULT STUD, 1988, LANCET, V2, P1043