共 12 条
- [1] AABY P, 1988, REV INFECT DIS, V10, P478
- [2] BARCLAY A, 1989, BMJ-BRIT MED J, V294, P294
- [3] Cohen J., 1988, STAT POWER CALCULATI
- [7] MARKOWITZ LE, 1990, PEDIATR CLIN N AM, V37, P603
- [9] VANREKEN D, 1985, PEDIATR INFECT DIS J, V4, P214
- [10] 1991, MMWR, V40, P369