1 Department of Respiratory Medicine, Amsterdam, The Netherlands; Department of Experimental Immunology (Amsterdam Infection & Immunity Institute), Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands. Electronic address: l.e.degroot@amsterdamumc.nl.
2 Department of Respiratory Medicine, Amsterdam, The Netherlands; Department of Experimental Immunology (Amsterdam Infection & Immunity Institute), Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.