@misc{indiciaeced171343e4a,
  title = {Diabetic retinopathy study. Data acquisition and its reliability.},
  author = {F Koerner and U Koerner and N Eichenseher},
  year = {1977},
  doi = {10.1007/bf00407865},
  url = {https://pubmed.ncbi.nlm.nih.gov/301717/},
  note = {Source identifier: 301717}
}