@misc{indiciae5676b28def2c,
  title = {Callipers.},
  author = {N D Penn},
  year = {1991},
  doi = {10.1136/bmj.302.6773.402},
  url = {https://pubmed.ncbi.nlm.nih.gov/2004148/},
  note = {Source identifier: 2004148}
}