1. Department of Pneumology, Allergology, Sleep and Respiratory Medicine Augustinians Hospital Cologne Germany
2. Department of Dermatology and Allergology University Hospital of RWTH Aachen Aachen Germany
3. Clinic for Hematology, General Oncology and Palliative Care Hospital Düren Düren Germany
4. Department of Dermatology and Allergology University Hospital of Bonn Bonn Germany