Herold R (2026). ctrdata: Retrieve and Analyze Clinical Trials Data from Public Registers. R package version 1.26.1.9000, https://cran.r-project.org/package=ctrdata.

Herold R (2026). “Aggregating and analysing clinical trials data from multiple public registers using R package ctrdata.” Research Synthesis Methods, 17(3), 624–656. ISSN 1759-2879, 1759-2887. doi:10.1017/rsm.2025.10061.

Corresponding BibTeX entries:

  @Manual{,
    title = {ctrdata: Retrieve and Analyze Clinical Trials Data from
      Public Registers},
    author = {Ralf Herold},
    year = {2026},
    note = {R package version 1.26.1.9000},
    url = {https://cran.r-project.org/package=ctrdata},
  }

  @Article{,
    title = {Aggregating and analysing clinical trials data from
      multiple public registers using R package ctrdata},
    doi = {10.1017/rsm.2025.10061},
    journal = {Research Synthesis Methods},
    author = {Ralf Herold},
    language = {en},
    journal = {Research Synthesis Methods},
    issn = {1759-2879, 1759-2887},
    year = {2026},
    volume = {17},
    number = {3},
    month = {may},
    pages = {624--656},
  }