1. Charité - Universitätsmedizin Berlin; Department of Dermatology; Allergology and Venerology Berlin Germany
2. Ernst-Moritz-Arndt-University Greifswald; Medical Faculty; Institute of Hygiene and Environmental Medicine Greifswald Germany
3. Klinikum - Klagenfurt am Wörthersee; Feschnigstraße 11 9020 Klagenfurt Austria