title: A reply.
authors.affiliation: Chelsea and Westminster Hospital, London, UK. j.m.handy@imperial.ac.uk.
authors.forename: J M
authors.initials: JM
authors.lastname: Handy
authors.forename: G E P
authors.initials: GE
authors.lastname: Godfrey
authors.forename: S
authors.initials: S
authors.lastname: Dubrey
mesh_terms: D004452:Echocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D013318:Stroke Volume / Q000502:physiology*