@misc{indiciaecd483e9eef2d,
  title = {What size sample do I need?},
  author = {G Williams},
  year = {1999},
  doi = {10.1111/j.1467-842x.1999.tb01241.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/10330744/},
  note = {Source identifier: 10330744}
}