1. Department of Orthopedics and Trauma Surgery, University Hospital Bonn, Bonn, Germany
2. University Hospital Freiburg, Center for Psychiatric Diseases, Freiburg, Freiburg i.Br., Germany
3. The Johns Hopkins University, Baltimore, MD, USA
4. Institute of Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany