@misc{indiciae42c5c8868cf8,
  title = {Universal spacer devices.},
  author = {D G Robertson},
  year = {1994},
  doi = {10.1016/s0140-6736(94)92724-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/7905973/},
  note = {Source identifier: 7905973}
}