1. Department of Dermatology Venereology and Allergology University Medical Center Göttingen Germany
2. German Pollen Information Service Foundation Berlin Germany
3. Lower Saxony Institute of Occupational Dermatology University Medical Center Göttingen Germany
4. Information Network of Departments of Dermatology (IVDK) University of Göttingen Germany
5. Georg‐August‐Universität Göttingen