title: [A brief history of twin study methods 2--actual formulation of methods].
authors.affiliation: Facoltà di Scienze Matematiche Fisiche e Naturali, Università degli Studi di Roma Tor Vergata, Roma, Italia. france-sca.lorenzi@usa.net
authors.forename: F
authors.initials: F
authors.lastname: Lorenzi
mesh_terms: D006801:Humans; D008962:Models, Theoretical; D018433:Twin Studies as Topic / Q000379:methods*