Geography, 10.10.2019 22:00 kaykay9243
7. purely observational epidemiologic studies do not usually include: a) cross-sectional studies c) experimental studies b) counts d) cohort studies which of the following is used to describe toxic effects of chemicals? a) aqi c) tfr 8 b) vocs d) ldso which best describes a risk characterization a) estimates the number of excess unwarranted health events expected at different time intervals.
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