共 25 条
[21]
1986, MMWR, V35, P317
[22]
1981, CDC848295 US DEP HLT, P16
[23]
1984, MMWR, V33, P417
[24]
1984, MMWR, V33, P455
[25]
1982, MMWR CDC SURVEILL SU, V31, P375