1 Department of Medicine V, Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany. Electronic address: k.benesova@hotmail.de.
2 Department of Medicine V, Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany.
3 Division of Rheumatology, Department of Medicine V, University Hospital Mannheim, Mannheim, Germany.