Correction to: Molecular Psychiatry 2002; 7: 851–859, doi:10.1038/sj.mp.4001114

Owing to a publisher error, this article was mistakenly published twice. It first appeared in Molecular Psychiatry 2002; 7: 594–603, doi:10.1038/sj.mp.4001025. The publisher apologizes for any confusion this may have caused.