共 26 条
[21]
1986, HOSPITAL STATISTICS
[22]
1986, MMWR, V35, P757
[23]
1985, MMWR, V34, P682
[24]
1986, PUBLIC HLTH REP, V101, P341
[25]
1987, MMWR S2S, V36, pS3
[26]
1986, MMWR, V35, P221