Patients with severe low back pain exhibit a low level of physical activity before lumbar fusion surgery: a cross-sectional study.
Hanna LotzkeMax JakobssonAnnelie GutkeMaria HagströmerHelena BrisbyOlle HäggRob SmeetsMari LundbergPublished in: BMC musculoskeletal disorders (2018)
Current Controlled Trials ISCRTN 17115599 , retrospectively Registered 18 may 2015.