@misc{indiciaec03b993118da,
  title = {Quantifying early diabetic retinopathy.},
  author = {J R Howard-Williams and C O Peckar and R R Holman and R C Turner and A J Bron},
  year = {1986},
  doi = {10.1007/bf00873213},
  url = {https://pubmed.ncbi.nlm.nih.gov/3817334/},
  note = {Source identifier: 3817334}
}