@misc{indiciaeb9117cb72204,
  title = {Alternatives to classic randomized trials.},
  author = {M Zelen},
  year = {1981},
  doi = {10.1016/s0039-6109(16)42596-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/7313934/},
  note = {Source identifier: 7313934}
}