@misc{indiciaee81118577ccf,
  title = {Visual acuity repeatability in keratoconus: impact on sample size. Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group.},
  author = {M O Gordon and K B Schechtman and L J Davis and T T McMahon and J Schornack and K Zadnik},
  year = {1998},
  doi = {10.1097/00006324-199804000-00021},
  url = {https://pubmed.ncbi.nlm.nih.gov/9586749/},
  note = {Source identifier: 9586749}
}