1. Institute of Medical Epidemiology Biostatistics, and Informatics Faculty of Medicine Martin‐Luther‐University Halle‐Wittenberg Halle/Saale Germany
2. Profile Centre of Health Sciences Halle Faculty of Medicine Martin‐Luther‐University Halle‐Wittenberg Halle/Saale Germany
3. Dept. of Dermatology University Medical Center Johannes Gutenberg, University Mainz Germany
4. Department of Dermatology Venereology and Allergology Wroclaw Medical University Wroclaw Poland
5. Department of Dermatology Faculty of Medicine University of Cologne Cologne Germany
6. Dermatology Outpatient Office Dr. Simone Garcovich Rome Italy
7. Dermatology Outpatient Office Hautmedizin Bad Soden Bad Soden Germany
8. Institute for Health‐ and Nursing Science Faculty of Medicine Martin‐Luther‐University Halle‐Wittenberg Halle/Saale Germany
9. Institute of General Practice and Family Medicine Faculty of Medicine Martin‐Luther‐University Halle‐Wittenberg Halle/Saale Germany
10. Department of Dermatology Medical Center Klinikum Darmstadt Teaching Hospital Goethe‐University Frankfurt Darmstadt Germany
11. Dermatology Outpatient Office Dr. Uwe Kirschner Mainz Germany
12. Departments of Dermatology Venereology, Allergology and Immunology Dessau Medical Center Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany