title: Commentary.
authors.affiliation: Boston Children's Hospital, Boston, MA 02115, USA. gerard.berry@childrens.harvard.edu
authors.forename: Gerard
authors.initials: G
authors.lastname: Berry
authors.forename: Harvey
authors.initials: H
authors.lastname: Levy
mesh_terms: D003937:Diagnosis, Differential; D006712:Homocystinuria / Q000175:diagnosis*; D006801:Humans; D008382:Marfan Syndrome / Q000175:diagnosis*