[1] Virginia Commonwealth Univ, Dept Psychiat, Richmond, VA USA
[2] Virginia Commonwealth Univ, Dept Human Genet, Richmond, VA USA
[3] Virginia Inst Psychiat & Behav Genet, Richmond, VA USA
[4] NIMH, Clin Brain Disorders Branch, NIH, Bethesda, MD 20892 USA
[5] Mater Hosp, Belfast, Antrim, North Ireland
[6] St Lomans Hosp, Dublin, Ireland