共 9 条
- [1] CANNER PL, 1980, NEW ENGL J MED, V303, P1038
- [2] CHALMERS TC, 1974, MT SINAI J MED, V41, P753
- [3] DIECKMANN WJ, 1953, AM J OBSTET GYNECOL, V66, P1062
- [4] EDWARDS, 1982, LANCET, V1, P275
- [6] NEVIN NC, 1975, BRIT J PREV SOC MED, V29, P111
- [7] SMITH OW, 1949, AM J OBSTET GYNECOL, V58, P994
- [8] SMITHELLS RW, 1980, LANCET, V1, P339
- [9] SMITHELLS RW, 1981, LANCET, V2, P1424