Bernd Puschner1
, Sabine Steffen1
, Wolfgang Gaebel2
, Harald Freyberger3
, Helmfried E Klein4
, Tilman Steinert5
, Rainer Muche6
and Thomas Becker1 
1Department of Psychiatry II, Ulm University, BKH Günzburg, Ludwig-Heilmeyer-Str. 2, 89312 Günzburg, Germany
2Department of Psychiatry and Psychotherapy, Heinrich-Heine-University Düsseldorf, Bergische Landstr. 2, 40629 Düsseldorf, Germany
3Department of Psychiatry and Psychotherapy, Greifswald University, Rostocker Chaussee 70, 18437 Stralsund, Germany
4Department of Psychiatry and Psychotherapy, Regensburg University, Universitätsstr. 84, 93053 Regensburg, Germany
5Department of Psychiatry I, Ulm University, Ravensburg, Weingartshofer Str. 2, 88214 Ravensburg, Germany
6Institute for Biometrics, Ulm University, Schwabstr. 13, 89075 Ulm, Germany