Most<unk> s are on one of six topics: * An unexpected association between diseases or symptoms. * An unexpected event in the course of observing or treating a patient. * Findings that shed new light on the possible pathogenesis of a disease or an adverse effect. * Unique or rare features of a disease. * Unique therapeutic approaches. * A positional or quantitative variation of the anatomical structures.
Case report
Clinical study report
Cohort study
Case series
Natural history group
Natural history study
Population study
Retrospective cohort study