1 Department of Psychiatry and Psychotherapy, University of Magdeburg, D-39120 Magdeburg, Germany. Electronic address: hans-gert.bernstein@med.ovgu.de.
2 Institute of Biochemistry and Cell Biology, Medical Faculty, University of Magdeburg, D-39120 Magdeburg, Germany.
3 Department of Psychiatry and Psychotherapy, University of Magdeburg, D-39120 Magdeburg, Germany.