M.L.L. Prevoo1, Anke M. van Gestel2, M. A. VAN THOF3, M. H. van Rijswijk4, L.B.A. van de Putte2, Piet L. C. M. van Riel2
1Department of Rheumatology; University Hospital Nijmegen The Netherlands
2Departments of RheumatologyThe Netherlands
3Departments of Statistics, University Hospital NijmegenThe Netherlands
4Department of Rheumatology, University Hospital GroningenThe Netherlands