@misc{indiciae6c88affc3428,
  title = {Responsibilities associated with obstetric sonography.},
  author = {G R Leopold},
  year = {1989},
  doi = {10.2214/ajr.153.6.1255},
  url = {https://pubmed.ncbi.nlm.nih.gov/2683679/},
  note = {Source identifier: 2683679}
}