Discuss the different sources of epidemiologic data

Discuss the different sources of epidemiologic data and what each is used for.
Your response must be at least 500 words in length.
2. Present the most important criteria for assessing the quality and utility of epidemiologic data? Explain why these criteria are so important.
Your response must be at least 200-400 words in length.
3. Describe epidemiologic data from insurance companies, hospitals, special clinics, physician practices, and school health programs. For each of these, explain briefly how the data can be obtained and utilized.
Your response must be at least 200-400 words in length.
4. What is meant by an “observational” approach in epidemiology? Provide at least one example of this approach.
Your response must be at least 200-400 words in length.