Are the C-reactive protein values and erythrocyte sedimentation rate equivalent when estimating the 28-joint disease activity score in rheumatoid arthritis?

1. Castrejón, I.
2. Ortiz, A.M.
3. García-Vicuña, R.
4. Lopez-Bote, J.P.
5. Humbría, A.
6. Carmona, L.
7. Gonzalez-Alvaro, I.