@misc{indiciae4fab01afdc77,
  title = {Validity and reliability--What's it all about? Part 1. Validity in quantitative studies.},
  author = {Alison Twycross and Linda Shields},
  year = {2004},
  doi = {10.7748/paed2004.11.16.9.28.c954},
  url = {https://pubmed.ncbi.nlm.nih.gov/15633276/},
  note = {Source identifier: 15633276}
}