Sowden, G., Main, C., Van Der Windt, D., Burton, K., & Wynne-Jones, G. (2019). The development and content of the vocational advice intervention and training package for the Study of Work And Pain (SWAP) trial (ISRCTN 52269669). Journal of Occupational Rehabilitation, 29, 295-405. https://doi.org/10.1007/s10926-018-9799-1