@misc{indiciae8aa252169cb0,
  title = {What is Zelen's design?},
  author = {D J Torgerson and M Roland},
  year = {1998},
  doi = {10.1136/bmj.316.7131.606},
  url = {https://pubmed.ncbi.nlm.nih.gov/9518917/},
  note = {Source identifier: 9518917}
}