@misc{indiciae78e1afe0caf6,
  title = {Interobserver variability in grading Perthes' disease.},
  author = {E D Simmons and H K Graham and J P Szalai},
  year = {1990},
  doi = {10.1302/0301-620x.72b2.2312555},
  url = {https://pubmed.ncbi.nlm.nih.gov/2312555/},
  note = {Source identifier: 2312555}
}