共 20 条
[1]
ANSURA EL, 1985, AM J OBSTET GYNECOL, V151, P87
[2]
ARMITAGE P, 1971, STATISTICAL METHODS
[3]
BENNETT JV, 1979, HOSPITAL INFECTIONS
[4]
BIERMAN EL, 1979, CECIL TXB MED, P1678
[6]
Breslow N, 1980, STATISTICAL METHODS, V32
[7]
BURKE JF, 1961, SURGERY, V50, P161
[8]
Cymer W E, 1988, Health Care Financ Rev, V9, P89