@misc{indiciae864a8e57d98b,
  title = {Referral bias: a difficult but important topic.},
  author = {Raymond J Gibbons},
  doi = {10.1016/j.nuclcard.2004.01.001},
  url = {https://pubmed.ncbi.nlm.nih.gov/15052239/},
  note = {Source identifier: 15052239}
}