DenmarkScandinaviaGreenlandRegistries: The systems and processes involved in the establishment, support, management, and operation of registers, e.g., disease registers.EuropeIncidence: The number of new cases of a given disease during a given period in a specified population. It also is used for the rate at which new events occur in a defined population. It is differentiated from PREVALENCE, which refers to all cases, new or old, in the population at a given time.SwedenRisk Factors: An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.Cohort Studies: Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesized to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics.Legislation, Veterinary: Laws and regulations, pertaining to the field of veterinary medicine, proposed for enactment or enacted by a legislative body.NorwayInfant, Newborn: An infant during the first month after birth.FinlandPoisson Distribution: A distribution function used to describe the occurrence of rare events or to describe the sampling distribution of isolated counts in a continuum of time or space.