@misc{indiciae533d33c6e18f,
  title = {Factors associated with multiple-pass procedures during chorionic villus sampling: a video analysis.},
  author = {R K Silver and S N MacGregor and E D Hobart},
  year = {1992},
  doi = {10.1002/pd.1970120307},
  url = {https://pubmed.ncbi.nlm.nih.gov/1589420/},
  note = {Source identifier: 1589420}
}