共 34 条
[1]
AMBUEL JP, 1968, AM J DIS CHILD, V108, P394
[3]
BARRON WM, 1980, PRIMARY CARE, V7, P563
[8]
COLTON T, 1974, STATISTICS MED
[9]
COX DR, 1972, J R STAT SOC B, V34, P187