1. Department of Psychiatry and Psychotherapy, Clinic Offenbach, Teaching Hospital of Goethe University, D-63069 Offenbach, Germany.
2. Department of Organic Chemistry, Gutenberg University, D-55128 Mainz, Germany.
3. Neurobiochemical Research Unit, Clinic and Polyclinic for Psychiatry and Psychotherapy, Heine University, D-40629 Düsseldorf, Germany.