- Preliminary findings of antistreptococcal antibody titers and basal ganglia volumes in tic, obsessive-compulsive, and attention deficit/hyperactivity disorders. Peterson, B.S., Leckman, J.F., Tucker, D., Scahill, L., Staib, L., Zhang, H., King, R., Cohen, D.J., Gore, J.C., Lombroso, P. Arch. Gen. Psychiatry (2000)