Zeitschrift für RheumatologieSeptember 2015, Volume 74, Issue 7, pp 652–656 | Cite asMitteilungenMitteilungen der DGRhFirst Online: 04 September 2015 23 Downloads This is a preview of subscription content, log in to check access.PreviewUnable to display preview. Download preview PDF.Unable to display preview. Download preview PDF.Copyright information© Springer-Verlag Berlin Heidelberg 2015