title: Sources of bias in heritability studies.
authors.forename: E F
authors.initials: EF
authors.lastname: Harris
authors.forename: R H
authors.initials: RH
authors.lastname: Potter
mesh_terms: D000704:Analysis of Variance; D015982:Bias; D002508:Cephalometry / Q000706:statistics & numerical data; D006801:Humans; D008445:Maxillofacial Development / Q000235:genetics; D018433:Twin Studies as Topic / Q000379:methods / Q000706:statistics & numerical data*; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic