@misc{indiciae597007471e1c,
  title = {The umbilical cord: normal parameters.},
  author = {G Ente and P H Penzer},
  year = {1991},
  doi = {10.1177/146642409111100406},
  url = {https://pubmed.ncbi.nlm.nih.gov/1941874/},
  note = {Source identifier: 1941874}
}