1. Department of Internal Medicine I, University of Cologne, Cologne, Germany.
2. German Center for Infection Research (DZIF), partner site Bonn-Cologne, Cologne, Germany.
3. Institute of Virology, University of Cologne, Cologne, Germany.
4. Department of Neurology, University of Cologne, Cologne, Germany.
5. Department of Internal Medicine and Rheumatology, m&i Specialty Hospital Bad Pyrmont, Bad Pyrmont, Germany.
6. Infectious Disease Unit, Department of Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
7. J. H. Goethe University Germany, Frankfurt, Germany.
8. Center for HIV and Hepatogastroenterology, Dusseldorf, Germany.
9. Institute of Medical Statistics, Informatics and Epidemiology, University of Cologne, Cologne, Germany.
10. Department of Medicine, University Medical Center, Bonn, Germany.