1. Clinical Research Center for Hair and Skin Science; Department of Dermatology and Allergy; Charité-Universitätsmedizin Berlin; Germany
2. Department of Dermatology and Allergy; Charité-Universitätsmedizin Berlin; Germany
3. Institute of Health and Nursing Science; Charité-Universitätsmedizin Berlin; Germany
4. Centre for Quality in Care; Berlin Germany