E de Klerk

Relative value of erythrocyte sedimentation rate and C-reactive protein in assessment of disease activity in ankylosing spondylitis.

Anneke Spoorenberg, Désirée van der Heijde, E de Klerk et al. · PubMed · 1999 · 321 citations

Immunology, Diagnosis, Axial Spondyloarthritis +20

Comparison between self-report measures and clinical observations of functional disability in ankylosing spondylitis, rheumatoid arthritis and fibromyalgia.

Alita Hidding, Marijke van Santen, E de Klerk et al. · PubMed · 1994 · 131 citations

Development of a questionnaire to investigate patient compliance with antirheumatic drug therapy.

E de Klerk, Désirée van der Heijde, Hille van der Tempel et al. · PubMed · 1999 · 122 citations

A comparative study of the usefulness of the Bath Ankylosing Spondylitis Functional Index and the Dougados Functional Index in the assessment of ankylosing spondylitis.

Anneke Spoorenberg, Désirée van der Heijde, E de Klerk et al. · PubMed · 1999 · 81 citations

Rheumatology, Dougados Functional Index, Disease Activity Variables +15

Radiological scoring methods in ankylosing spondylitis: reliability and sensitivity to change over one year.

Anneke Spoorenberg, Kurt De Vlam, Désirée van der Heijde et al. · PubMed · 1999 · 67 citations

Rheumatology, Intraobserver Kappa, Lumbar Spine +15