title: Research and statistics: cohort studies.
authors.affiliation: Division of General Pediatrics & Adolescent Medicine, Johns Hopkins University, Baltimore, Md., USA.
authors.forename: Raquel G
authors.initials: RG
authors.lastname: Hernandez
authors.forename: Peter C
authors.initials: PC
authors.lastname: Rowe
mesh_terms: D015746:Abdominal Pain / Q000453:epidemiology / Q000523:psychology*; D002648:Child; D015331:Cohort Studies; D006801:Humans; D008297:Male; D015588:Observer Variation; D018579:Patient Selection; D012574:Schools; D013315:Stress, Psychological / Q000453:epidemiology*