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Research and development of health 28 Planning and managing a health service in
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aetiological analysis Annual arboviruses areas arthropods assessment association bias case-control studies cause census cent changes cholesterol chronic clinical cohort studies collection coronary coronary heart disease costs cross-sectional studies death diagnosis distribution drug effects encephalitis England and Wales epidemic epidemiological estimates etal evaluation example exposure fever follow-up GB GB GB health services heart disease hospital hypertension identified illness important incidence individual infection information systems intervention investigation London measures methods monitoring morbidity mortality North Karelia Northern Ireland observed obtained occupation occur odds ratio OPCS operational research organization outcome patients period physician pollution population possible practice present prevalence problem procedures programme public health radiation rates records Registrar registry Report risk factors sample Scotland smoking social social class sources specific statistics subjects survey Table tion Togaviridae treatment validity variables virus viruses