@misc{indiciae74964121be72,
  title = {Ultrasound and the missing loop.},
  author = {R H Picker and D M Saunders},
  year = {1976},
  doi = {10.1111/j.1440-1673.1976.tb02009.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/1021123/},
  note = {Source identifier: 1021123}
}