The effectiveness of participatory ergonomics to prevent low-back and neck pain : results of a cluster randomized controlled trial.
How do job stress and ergonomic factors impact clinic visits in acute low back pain : a prospective study.
Two-year outcome of a multidisciplinary vocational rehabilitation programme focused on range of motion of the neck and back.
The impact of workplace ergonomics and neck specific exercise versus ergonomics and health promotion interventions on office worker productivity : a cluster randomised trial.
Epidemiological methods : the effect of envelope type on response rates in epidemiological study of back pain.