共 71 条
- [11] DUVAL MK, 1973, MED WORLD NEWS, V4, P19
- [12] EMANUEL I, 1977, EPIDEMIOLOGY PREMATU, P353
- [13] Fisher RA, 1935, NATURE, V136, P474
- [16] HARDY JB, 1972, LANCET, V2, P1332
- [17] HARDY JB, 1977, EPIDEMIOLOGY PREMATU, P105
- [20] HICKEY RJ, 1974, JAMA-J AM MED ASSOC, V230, P209