Lower Cognitive Performance in Normal Older Adult Male Twins Carrying the Apolipoprotein E-E4 Allele
Arch Neurol 51:1189-1192, Reed,T.,et al, 1994
Tourette's Syndrome in Monozygotic Twins:Relationship of Tic Severity to Neuropsychological Function
Arch Neurol 50:725-728, Randolph,C.,et al, 1993