共 17 条
- [1] BERGDOLL MS, 1981, LANCET, V1, P1017
- [2] BRESLOW NE, 1980, ANAL CASE CONTROL ST, P248
- [5] FRIEDRICH EG, 1980, OBSTET GYNECOL, V55, P149
- [6] JIMERSON SD, 1980, OBSTET GYNECOL, V56, P97
- [8] Nie N.H., 1975, SPSS STAT PACKAGE SO, VVolume 227
- [10] ROTHMAN KJ, 1979, EPIDEMIOLOGIC ANAL P, P5