@misc{indiciae69a5703395c8,
  title = {Methodological issues in drug usage surveys: anonymity, recency, and frequency.},
  author = {M J Luetgert and A H Armstrong},
  year = {1973},
  doi = {10.3109/10826087309057494},
  url = {https://pubmed.ncbi.nlm.nih.gov/4761647/},
  note = {Source identifier: 4761647}
}