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Epidemiology is the study (scientific, systematic, and data-driven) of the distribution (frequency, pattern) and determinants (causes, risk factors) of health-related states and events (not just diseases) in specified populations (neighborhood, school, city, state, country, global).

Health systems research provides evidence that, when applied, can make healthcare affordable, safe, effective, equitable, accessible, and patient-centered. The research generates new evidence to help health care systems and health care professionals improve the lives of the patients they serve.
Public Health Services and Systems Research (PHSSR) identifies the implementation strategies that work, building evidence to support decision-making across the public health sphere. Effective, efficient, and equitable public health services and systems build a healthier nation.