title: Cancer in children: is the sample biased.
authors.forename: J P
authors.initials: JP
authors.lastname: Damore
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D002648:Child; D002652:Child Behavior; D006801:Humans; D009369:Neoplasms / Q000188:drug therapy / Q000453:epidemiology / Q000523:psychology*; D015983:Selection Bias