@misc{indiciae710283129be4,
  title = {Vacuum extractor: a safe instrument?},
  author = {H Y Ngan and G W Tang and H K Ma},
  year = {1986},
  doi = {10.1111/j.1479-828x.1986.tb01561.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3468937/},
  note = {Source identifier: 3468937}
}