1 Alfredo Ramirez, MD, Ph.D., Division of Neurogenetics and Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University of Cologne, Kerpener Strasse 62, 50937 Cologne, Germany. Tel./Fax: +49-221-478-98041/98042, e-mail: alfredo.ramirez@uk-koeln.de.