@misc{indiciae5af1b8976396,
  title = {Cervical sonography in preterm labor.},
  author = {J D Iams and J Paraskos and M B Landon and J N Teteris and F F Johnson},
  year = {1994},
  url = {https://pubmed.ncbi.nlm.nih.gov/8008320/},
  note = {Source identifier: 8008320}
}