Socio-economic inequalities in occurrence and health care costs in rheumatic and musculoskeletal diseases: results from a Spanish population-based study including 1.9 million persons

1. Putrik, P.
2. Ramiro, S.
3. Orueta, J.F.
4. Keszei, A.
5. Alonso Moran, E.
6. Nuño Solinis, R.
7. Boonen, A.