@misc{indiciae2ed03c83644f,
  title = {Alan usher},
  author = {A Usher},
  year = {1998},
  doi = {10.1136/bmj.317.7170.1457},
  url = {https://pubmed.ncbi.nlm.nih.gov/9822419/},
  note = {Source identifier: 9822419}
}