1 Section for Outcomes Research, Center for Medical Statistics, Informatics, and Intelligent Systems, Medical University of Vienna, Vienna, Austria Division of Rheumatology, Department of Medicine 3, Medical University of Vienna, Vienna, Austria.
2 Division of Rheumatology, Department of Medicine 3, Medical University of Vienna, Vienna, Austria Department of Internal Medicine, Centre for Rheumatic Diseases, Hietzing Hospital, Vienna, Austria.