1 Division of Rheumatology, Department of Medicine, Solna and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.
2 Dermato-Venereology Clinic, Karolinska University Hospital, Stockholm, Sweden.
3 Dermato-Venereology Clinic, Uppsala Academic University Hospital, Uppsala, Sweden.
4 Dermato-Venereology Clinic, Skåne university hospital, Lund, Sweden.
5 Department of Clinical Sciences, Lund University, Lund, Sweden.
6 Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, and Department of Hematology, Karolinska University Hospital, Stockholm, Sweden.