1 Center of Internal Medicine, Infectious Diseases Unit, University Hospital Frankfurt, Goethe University, Frankfurt, Germany.
2 Institute for Medical Virology, University Hospital Frankfurt, Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt, Germany.
3 Center of Internal Medicine, Infectious Diseases Unit, University Hospital Frankfurt, Goethe University, Frankfurt, Germany. c.stephan@em.uni-frankfurt.de.