@misc{indiciae0349be700b40,
  title = {Emergency obstetrical ultrasonography.},
  author = {P M Doubilet and C B Benson},
  year = {1998},
  doi = {10.1016/s0037-198x(98)80041-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/9800244/},
  note = {Source identifier: 9800244}
}