共 12 条
- [2] *NAT CTR HLTH STAT, 1987, DHHS PHS871250 PUB
- [3] *NAT CTR HLTH STAT, 1987, DHHS PHS871120 PUB
- [4] PLACEK P, 1987, AM DEMOGR, V9, P46
- [6] PLACEK PJ, 1980, PUBLIC HEALTH REP, V95, P540
- [7] CESAREAN RATE INCREASES IN 1985 [J]. AMERICAN JOURNAL OF PUBLIC HEALTH, 1987, 77 (02) : 241 - 242
- [9] PLACEK PJ, 1983, PUBLIC HEALTH REP, V98, P396
- [10] PLACEK PJ, 1986, STAT B, V67, P9