1 The Breathing Institute, Children's Hospital of Colorado and Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO, United States.
2 University Hospital Carl Gustav Carus, Technical University of Dresden, Dresden, Germany.
3 TA Respiratory Diseases/Biosimilars Medicine, Boehringer Ingelheim International GmbH, Ingelheim am Rhein, Germany.
4 Klinik für Kinder- und Jugendmedizin, Evangelisches Klinikum Bethel, Bielefeld, Germany.
5 Allergy Center of the Ruhr University, Bochum, Germany.