Backache (6) Patients (5) Patients (5) puits (4) association (4) Social groups (4) Human beings (4) information (3) Weights and measures (3) Speed (3) Pain (3) Muscles (3) Confidence (3) Back (3) Influence (3) Speed (3) enquête (2) gestion (2) Protection (2) Work (2) Lumbar vertebrae (2) Swiss (2) Population (2) Nature (2) Motion (2) Manufacturers' agents (2) Management (2) Forecasting--Study and teaching (2) Evidence (2) Electromyography (2)