title: The heterogeneity in clinical presentation among individuals on the autism  spectrum is a remarkably puzzling facet of this set of disorders.
authors.forename: David
authors.initials: D
authors.lastname: Mandell
mesh_terms: D020817:Asperger Syndrome / Q000145:classification / Q000175:diagnosis / Q000523:psychology; D002648:Child; D002659:Child Development Disorders, Pervasive / Q000145:classification / Q000175:diagnosis* / Q000523:psychology / Q000628:therapy; D003937:Diagnosis, Differential; D039721:Diagnostic and Statistical Manual of Mental Disorders; D004185:Disability Evaluation; D006801:Humans