1. Introduction. 2. Biologic and statistical concepts. 3. Sources of routinely collected data on disease occurence. 4. Prospective cohort studies: planning and execution. 5. Retrospective cohort, nested case-control, and case-cohort studies: planing and execution. 6. Cohort studies: statistical analysis I. 7. Cohort studies: statistical analysis II. 8. Case-control studies: planning and execution. 9. Case-control studies: further design considerations and analysis. 10. Cross-sectional and other types of studies. 11. Epidemic investigation. 12. Methods of sampling and estimation of sample size. 13. Measurement error. 14. Measurement I: questionnaires. 15. Measurement II: other types of measurement.
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