1. German Rheumatism Research Center, Berlin;
2. Department of Rheumatology and Clinical Immunology,
3. Regenerative Immunology and Aging, Berlin-Brandenburg Center for Regenerative Therapies
4. Department of Hematology and Oncology and
5. Institute for Transfusion Medicine, Charité Universitätsmedizin Berlin, Berlin; and
6. Rheuma-Klinik Berlin-Buch, Berlin, Germany