共 28 条
[3]
[Anonymous], CAUSAL THINKING HLTH
[4]
BUCHANAN RL, 1996, J FOOD PROTECT, V55, P509
[8]
Cook ThomasD., 1979, Quasi-experimentation: Design analysis issues for field settings
[9]
*DHHS, 1964, US SURG GEN ADV COMM
[10]
EVANS AS, 1976, YALE J BIOL MED, V49, P175