The analysis will follow an intention-to-treat approach. For the analysis of the effect of intervention on pain in the three body regions, the primary outcome measure will be the pain score change (difference between the mean post-intervention pain level, collected during the last 4 weeks of their participation in the study, minus the mean pre-intervention pain level). Because the analysis uses an intention to treat approach, if the subject drops out of the study early, the investigators will use the pain data from the 4 weeks prior to the drop out point to estimate the mean post-intervention pain score. Therefore, the investigators collect weekly symptoms data throughout the intervention period. The subjects studied are in relatively stable occupational settings, so the investigators do not anticipate that many subjects will leave early. Ultimately, if there is a change in pain scores after the intervention, all of the weekly data will be used graphically to explore the time course of change. Missing weekly pain scores will be imputed by the mean of the scores just prior to and following the missing data.