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1. To describe the distribution and magnitude of health and disease problems in the human population.
2. To identify etiological factors in the pathogenesis of diseases.
3. To provide data essential to the planning, implementation, and evaluation of services for the prevention, control, and treatment of diseases and setting priorities among those services.
4. Study natural history and prognosis of diseases.
5. Evolute both existing and newly developed prevention and therapeutically measure.
6. Provide the foundation for developing public policy.