To cite package 'kfre' in publications use:

  Shpaner L (2026). _kfre: KFRE Risk Prediction Tools (R)_. R package,
  <https://lshpaner.github.io/kfre_r/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {kfre: KFRE Risk Prediction Tools (R)},
    author = {Leonid Shpaner},
    year = {2026},
    note = {R package},
    url = {https://lshpaner.github.io/kfre_r/},
  }

  Tangri N, Stevens L, Griffith J, Tighiouart H, Djurdjev O, Naimark D,
  Levin A, Levey A (2011). “A predictive model for progression of
  chronic kidney disease to kidney failure.” _JAMA_, *305*(15),
  1553-1559. doi:10.1001/jama.2011.451
  <https://doi.org/10.1001/jama.2011.451>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A predictive model for progression of chronic kidney disease to kidney failure},
    author = {Navdeep Tangri and Lesley A. Stevens and John L. Griffith and Hassan Tighiouart and Ognjenka Djurdjev and Dina Naimark and Adeera Levin and Andrew S. Levey},
    journal = {JAMA},
    year = {2011},
    volume = {305},
    number = {15},
    pages = {1553--1559},
    doi = {10.1001/jama.2011.451},
  }

  Tangri N, Grams M, Levey A, Coresh J (2016). “Multinational
  assessment of accuracy of equations for predicting risk of kidney
  failure: A meta-analysis.” _JAMA_, *315*(2), 164-174.
  doi:10.1001/jama.2015.18202
  <https://doi.org/10.1001/jama.2015.18202>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Multinational assessment of accuracy of equations for predicting risk of kidney failure: A meta-analysis},
    author = {Navdeep Tangri and Morgan E. Grams and Andrew S. Levey and Josef Coresh},
    journal = {JAMA},
    year = {2016},
    volume = {315},
    number = {2},
    pages = {164--174},
    doi = {10.1001/jama.2015.18202},
  }

  Sumida K, Nadkarni G, Grams M (2020). “Conversion of urine
  protein-creatinine ratio or urine dipstick protein to urine
  albumin-creatinine ratio for use in CKD screening and prognosis.”
  _Annals of Internal Medicine_, *173*(6), 426-435.
  doi:10.7326/M20-0529 <https://doi.org/10.7326/M20-0529>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Conversion of urine protein-creatinine ratio or urine dipstick protein to urine albumin-creatinine ratio for use in CKD screening and prognosis},
    author = {Kevin Sumida and Girish N. Nadkarni and Morgan E. Grams},
    journal = {Annals of Internal Medicine},
    year = {2020},
    volume = {173},
    number = {6},
    pages = {426--435},
    doi = {10.7326/M20-0529},
  }