2 Center for Rhinology and Allergology of the ENT University Clinic Mannheim, Wiesbaden.
3 University Clinic for Pediatrics and Adolescent Medicine, Bethel Children's Center, Evangelical Hospital Bielefeld gGmbH, Bielefeld.
4 Department of Otorhinolaryngology, Head and Neck Surgery, Section of Rhinology and Allergy, University Hospital Marburg, Philipps-Universität Marburg, Marburg.
5 Ruhrlandklinik gGmbH, West German Lung Center at the University Hospital Essen - University Hospital.
6 Clinic of Otorhinolaryngology, University Hospital Düsseldorf.
7 Clinic of Dermatology, Allergology, and Venerology, Hannover Medical School,and.
8 Allergy Center-Charité, Clinic for Dermatology, Venerology, and Allergology, Campus Charité Mitte, University Medicine Berlin, Germany.