Nomikos, P. A., Hall, M., Fuller, A., Millar, B., Ogollah, R., Valdes, A., Doherty, M., Walsh, D. A., Das Nair, R., & Abhishek, A. (2021). Fidelity assessment of nurse-led non-pharmacological package of care for knee pain in the package development phase of a feasibility randomised controlled trial based in secondary care: A mixed methods study. BMJ Open, 11(7), Article e045242. https://doi.org/10.1136/bmjopen-2020-045242