1 Division of Infectious Diseases, Department of Internal Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, Netherlands. Electronic address: g.j.debree@amc.uva.nl.
2 Laboratory of Experimental Virology, Department of Medical Microbiology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, Netherlands; Department of Microbiology and Immunology, Weill Medical College of Cornell University, New York, NY, USA.