A fifth may pertain-to a cohort.Logical formLearned from2 sentences. Cohorts may be studied.Logical formLearned from2 sentences. A cohort can be (percent female).Logical formLearned from2 sentences. An entry may pertain-to a cohort.Logical formLearned from2 sentences. A cohort may have some family.Logical formLearned from2 sentences. A cohort may provide an opportunity.Logical formLearned from2 sentences. Cohorts may be identified.Logical formLearned from2 sentences. (Validation studies) may be conducted of a sample of some (registry cohort).Logical formLearned from2 sentences. Cohorts may be biassed.Logical formLearned from2 sentences. A sample can be constituted-of-or-filled-with some (registry cohort).Logical formLearned from2 sentences. Cohorts can be retrospective.Logical formLearned from2 sentences. A cohort can be studied.Logical formLearned from2 sentences. A (cohort study) may provide an association.Logical formLearned from2 sentences. (Benefit reductions) can be across cohorts.Logical formLearned from2 sentences. An (insurance period) can be for an (age cohort).Logical formLearned from2 sentences.