1. University of Tuebingen, Tuebingen, Germany
2. Institute for Neuro- and Bioinformatics, University of Luebeck, Luebeck, Germany
3. Institute for Bioinformatics and Medical Informatics, University of Tuebingen, Germany
4. Department of Internal Medicine VI/Psychosomatic Medicine and Psychotherapy, University Hospital Tuebingen, Tuebingen, Germany