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Shadick, N., Sowell, N., Frits, M., Hoffman, S., Hartz, S., Booth, F., Sweezy, M., Rogers, P., Dubin, R., Atkinson, J., Friedman, A., Augusto, F., Iannaccone, C., Fossel, A., Quinn, G., Cui, J., Losina, E., & Schwartz, R. (2013). A randomized controlled trial of an internal family systems-based psychotherapeutic intervention on outcomes in rheumatoid arthritis: A proof-of- concept study. The Journal of Rheumatology, 40(11). doi:10.3899/jrheum.121465.
For more, see the IFS Institute, via the external link to their website: https://ifs-institute.com/
There is a vast literature supporting the efficacy of EMDR. There are too many published scientific papers to list here. However a comprehensive catalogue is provided by the EMDR Institute, and this can be accessed via this external link to their website: https://www.emdr.com/research-overview/
You can also read more on key EMDR research studies at the EMDR Association UK, and these can be accessed via this external link to their website: https://emdrassociation.org.uk/discover-emdr/research/