@misc{indiciaec1420acc6694,
  title = {Substantial effective sample sizes were required for external validation studies of predictive logistic regression models.},
  author = {Yvonne Vergouwe and Ewout W Steyerberg and Marinus J C Eijkemans and J Dik F Habbema},
  year = {2005},
  doi = {10.1016/j.jclinepi.2004.06.017},
  url = {https://pubmed.ncbi.nlm.nih.gov/15845334/},
  note = {Source identifier: 15845334}
}