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This Concept Map, created with IHMC CmapTools, has information related to: Cohort Studies, groups with special personal characteristics estimating risk, recruited to a study at about the same time and followed up for the same period of time if not problems in the analysis of data arise, Advantages possible to decrease bias as comparison groups are built into the study from the start, risk in relation to a suspected causal agent, the need to use a total time at risk in each group as denominator, cohort studies divide groups with special exposures, recruitment of external control group, cohort studies involves investigation of groups of people, Cohort Studies has Disadvantages, follow-up of subjects due to migration & withdrawal of cooperation, a suspected causal agent with NO control group, Disadvantages not possible to follow-up of subjects, no manifestations of the disease under study at the time they are recruited ideally recruited to a study at about the same time and followed up for the same period of time, study of external control group, groups with special personal characteristics estimating prevalence, groups with special exposures requires recruitment, incidence in relation to a suspected causal agent, groups with special exposures requires study, Disadvantages not possible to be certain that supposed aetiological factors are in fact causal, Advantages possible to determine incidence of disease in exposed & non-exposed groups