Epidemiology, Diseases frequency, Mortality, Morbidity, Plase, Time, Bibliography, Incidence
Place, Time, Cohnt, Studies,Disease, Strategies, Genetics, Epintervention, Control, Frequency
Epidemiology, Classification of Disease, Sources of Data, Place, Cohort Studies, Intervention Studies.
The place of epidemiology in the investigation of disease, ways of classifying ill or disabled persons, the strategy of epidemiology, other characteristics of persons, birth order and parental age