title: Direction of causality.
authors.affiliation: Institute for Behavioral Genetics and Department of Psychology, University of Colorado, Boulder, USA.
authors.forename: G
authors.initials: G
authors.lastname: Carey
mesh_terms: D015984:Causality; D006801:Humans; D008957:Models, Genetic; D012107:Research Design; D018433:Twin Studies as Topic; D014427:Twins / Q000235:genetics*