1. Clinical Research Hamburg, Wissenschafliches Institut, Hamburg;
2. Department of General Internal Medicine, University Kiel;
3. Department of Medicine I with Polyclinic and
4. Hospital Neukölln, Berlin;
5. Center for Internal Medicine, University Gießen;
6. Pathological Institute of the University, University Erlangen;
7. Institute for Medical Microbiology and Hygiene, University Freiburg, Germany