title: [Brief about sample size].
authors.affiliation: Universitetssjukhuset i Orebro, samt enheten för klinisk epidemiologi, Karolinska Universitetssjukhuset Solna. jonasludvigsson@yahoo.com
authors.forename: Jonas E
authors.initials: JE
authors.lastname: Ludvigsson
mesh_terms: D035843:Biomedical Research; D006801:Humans; D018401:Sample Size