@misc{indiciae8de3793a596b,
  title = {Grading scale for mask ventilation.},
  author = {Richard Han and Kevin K Tremper and Sachin Kheterpal and Michael O'Reilly},
  year = {2004},
  doi = {10.1097/00000542-200407000-00059},
  url = {https://pubmed.ncbi.nlm.nih.gov/15220820/},
  note = {Source identifier: 15220820}
}