@misc{indiciae9dae514acf7b,
  title = {Picking safe combinations.},
  author = {Steven L Shafer},
  year = {2004},
  doi = {10.1097/00000542-200412000-00003},
  url = {https://pubmed.ncbi.nlm.nih.gov/15564930/},
  note = {Source identifier: 15564930}
}