共 87 条
[44]
CASE CONTROL STUDY - PROBLEM AND THE PROSPECT
[J].
JOURNAL OF CHRONIC DISEASES,
1979, 32 (1-2)
:139-144
[45]
JOBE JB, 1990, AM J EPIDEMIOL, V132, P824
[48]
Kelsey JL, 1986, METHODS OBSERVATIONA
[49]
KOONS DA, 1973, VITAL HLTH STATISTIC, V2