Correction to: Clinical Rheumatology (2019) 38:1351–1360

https://doi.org/10.1007/s10067-019-04428-1

In the Acknowledgement section of the original published version of the above article, the authors requested to add the statement “This work was supported by Research Fund of the Ataturk University. Project Number: TUA-2018-6408.”

The Acknowledgments section has been corrected as follows: