1. Laboratory of Immune Cell Biology, Center for Cancer Research; Dermatology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
2. Department of Dermatology, University Hospital Zurich, 8091 Zurich, Switzerland
3. Laboratory of Applied Immunobiology, University of Zurich, 8006 Zurich, Switzerland
4. Institute of Pathology, University Hospital Heidelberg, 69120 Heidelberg, Germany