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Title
Effect of firmness of mattress on chronic non-specific low-back pain: randomised, double-blind, controlled, multicentre trial.
Authors
Kovacs FM; Abraira V; Peña A; Martín-Rodríguez JG; Sánchez-Vera M; Ferrer E; Ruano D; Guillén P; Gestoso M; Muriel A; Zamora J; Gil del Real MT; Mufraggi N