@misc{indiciaedab1f645e02b,
  title = {Two hard lessons.},
  author = {Paul W Armstrong},
  year = {2003},
  doi = {10.1016/s0140-6736(03)13133-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/12727394/},
  note = {Source identifier: 12727394}
}