1. Department of Medicine 3—Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
2. Deutsches Zentrum für Immuntherapie, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
3. Exploratory Research Unit, Optical Imaging Competence Centre, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
4. Lymphocyte Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
5. Center for Advanced Tissue Imaging (CAT-I), National Institute of Allergy and Infectious Diseases and National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA;