title: [Shortly about cohort studies].
authors.affiliation: Barnkliniken, Universitetssjukhuset Orebro. jonasludvigsson@yahoo.com
authors.forename: Jonas F
authors.initials: JF
authors.lastname: Ludvigsson
mesh_terms: D015331:Cohort Studies; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D012044:Regression Analysis; D012307:Risk Factors