@misc{indiciae211c1b5ed13f,
  title = {Evaluation of negative studies.},
  author = {J Higginson},
  year = {1989},
  doi = {10.1016/0273-2300(89)90040-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/2756163/},
  note = {Source identifier: 2756163}
}