See for background and considerations on the need for a governance structure within which research on treatment data could take place:

Central Ethics Committee at the German Medical Association (2023). Provision and use of treatment data for research purposes. Deutsches Ärzteblatt, 120(9), A-409 / B-349, 2ff. https://doi.org/10.3238/arztebl.zeko_sn_behandlungsdaten2022_en

Tiffin, N., George, A., & LeFevre, A. E. (2019). How to use relevant data for maximal benefit with minimal risk: digital health data governance to protect vulnerable populations in low-income and middle-income countries. BMJ Global Health 4(2), e001395. https://gh.bmj.com/content/bmjgh/4/2/e001395.full.pdf

Scheibner, J., Ienca, M., Kechagia, S., Troncoso-Pastoriza, J. R., Raisaro, J. L., Hubaux, J. P., Fellay, J., & Vayena, E. (2020). Data protection and ethics requirements for multisite research with health data: a comparative examination of legislative governance frameworks and the role of data protection technologies. Journal of law and the biosciences, 7(1), lsaa010. https://doi.org/10.1093/jlb/lsaa010