[1] Babraham Inst, Dept Neurobiol, Cambridge CB2 4AT, England
[2] UK Human Genome Mapping Project Resource Ctr, Cambridge CB10 1SB, England
[3] Addenbrookes Hosp, Dept Psychiat, Cambridge CB2 2QQ, England
[4] Univ Auckland, Fac Med & Hlth Sci, Auckland 1, New Zealand
[5] Tokyo Metropolitan Matsuzawa Hosp, Dept Psychiat, Tokyo, Japan
[6] Juntendo Univ, Sch Med, Dept Psychiat, Bunkyo Ku, Tokyo 113, Japan
[7] Univ Murcia, Sch Med, Dept Morphol Sci & Psychobiol, E-30001 Murcia, Spain