title: Same sex twins should give consent for zygosity testing except when medically necessary.
authors.affiliation: London, UK.
authors.forename: Sarah E A
authors.initials: SE
authors.lastname: Smith
authors.affiliation: London, UK.
authors.forename: Lucy K A
authors.initials: LK
authors.lastname: Carr
authors.affiliation: Sutton Coldfield, UK.
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Smith
authors.affiliation: Birmingham, UK.
authors.forename: Russell E A
authors.initials: RE
authors.lastname: Smith
mesh_terms: D006801:Humans; D014427:Twins; D014430:Twins, Monozygotic