Effect of firmness of mattress on chronic non-specific low-back pain: Randomised, double-blind, controlled, multicentre trial

1. Kovacs, F.M.
2. Abraira, V.
3. Peña, A.
4. Martín-Rodríguez, J.G.
5. Sánchez-Vera, M.
6. Ferrer, E.
7. Ruano, D.
8. Guillén, P.
9. Gestoso, M.
10. Muriel, A.
11. Zamora, J.
12. Gil Del Real, M.T.
13. Mufraggi, N.