@misc{indiciaed796900424b3,
  title = {Should study subjects see their previous responses: data from a randomized control trial.},
  author = {G H Guyatt and M Townsend and J L Keller and J Singer},
  year = {1989},
  doi = {10.1016/0895-4356(89)90105-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/2778469/},
  note = {Source identifier: 2778469}
}