1 Division of Infectious Diseases, Department of Medicine II, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg 79106, Germany. Electronic address: siegbert.rieg@uniklinik-freiburg.de.
2 Division of Infectious Diseases, Department of Medicine II, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg 79106, Germany.
3 IDIBAPS, Hospital Clínic of Barcelona, University of Barcelona, Barcelona, Spain.