Autism
Lancet 374:1627-1638, Levy,S.,et al, 2009
Learning Disability
Lancet 362:811-821, Gillberg,C.&Soderstrom,H., 2003
Tourette's Syndrome in Monozygotic Twins:Relationship of Tic Severity to Neuropsychological Function
Arch Neurol 50:725-728, Randolph,C.,et al, 1993