Effect of stretching exercises on pain and functional disability in quarry workers with work-related low back pain [online]
Effect of workplace versus home-based physical exercise on musculoskeletal pain among healthcare workers.
Long term effectiveness of an educational and physical intervention for preventing low back pain recurrence : a randomised controlled trial.
Association between occupational lifting and day-to-day change in low back pain intensity based on company records and text messages.
Epidemiological methods : the effect of envelope type on response rates in epidemiological study of back pain.