To cite package ‘ckbtools’ in publications use:

  China Kadoorie Biobank Collaborative Group (2026). “ckbtools: Tools
  for analyses in epidemiology.”
  <https://ckbiobank.github.io/ckbtools>.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {ckbtools: Tools for analyses in epidemiology},
    author = {{China Kadoorie Biobank Collaborative Group}},
    year = {2026},
    url = {https://ckbiobank.github.io/ckbtools},
  }