@misc{indiciae87a60faeb55a,
  title = {Detecting diabetic retinopathy.},
  author = {R E Ryder and C A Hardisty},
  year = {1991},
  doi = {10.1136/bmj.302.6777.659-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/1821621/},
  note = {Source identifier: 1821621}
}