1. Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, D-49076 Osnabrück, Germany
2. University Clinic for Dermatology, Johannes Wesling Medical Centre, D-32429 Minden, Germany
3. Institute for Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry (IFMPEGKC), RWTH University Hospital Aachen, D-52074 Aachen, Germany
4. Institute of Nutrition, University of Giessen, D-35390 Giessen, Germany
5. Institute for Clinical Chemistry and Laboratory Medicine, University Hospital of Regensburg, University of Regensburg, D-93053 Regensburg, Germany