1 Department of Pediatric Respiratory Medicine, Immunology and Critical Care Medicine Berlin, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 13353 Berlin, Germany. Electronic address: cornelia.feiterna-sperling@charite.de.
2 Department of Pediatric Respiratory Medicine, Immunology and Critical Care Medicine Berlin, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 13353 Berlin, Germany.
3 Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Germany; Labor Berlin Charité-Vivantes GmbH, Berlin, Germany.