1. Department of DermatologyUniversity Medical Centre Regensburg Regensburg Germany
2. Centre for Clinical StudiesUniversity Medical Centre Regensburg Regensburg Germany
3. Department of Dermatology and AllergologyKlinikum Vest GmbH Recklinghausen Germany
4. Institute of BiochemistryFriedrich‐Alexander University Erlangen‐Nürnberg Erlangen Germany