@misc{indiciaed874904922f4,
  title = {PGs (picograms) for PGs (postgraduates).},
  author = {P C Doehring},
  year = {1970},
  doi = {10.1056/nejm197004022821430},
  url = {https://pubmed.ncbi.nlm.nih.gov/5416992/},
  note = {Source identifier: 5416992}
}