1 Department of Dermatology, University Medical Center Mainz, Mainz, Germany. Electronic address: Miriam.Wittmann@unimedizin-mainz.de.
2 Department of Dermatology, University Medical Center Mainz, Mainz, Germany.
3 Leeds Institute of Rheumatic and Musculoskeletal Medicine, School of Medicine, University of Leeds, Leeds, United Kingdom; The National Institute for Health Research Leeds Biomedical Research Centre, Leeds Teaching Hospitals, Leeds, United Kingdom.