共 10 条
[1]
DIXON WJ, 1983, BMDP STATISTICAL SOF
[2]
HAGER WD, 1983, OBSTET GYNECOL, V61, P113
[5]
LAWLESS JF, 1982, STATISTICAL MODELS M
[6]
STJOHN RK, 1980, AM J OBSTET GYNECOL, V138, P845
[8]
1982, MMWR, V31, pS43
[9]
1974, MMWR, V23, P431
[10]
1979, MMWR, V28, P13