@misc{indiciae3f4756dd8fe8,
  title = {Subgroup analysis.},
  author = {C J Bulpitt},
  year = {1988},
  doi = {10.1016/s0140-6736(88)92956-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2898630/},
  note = {Source identifier: 2898630}
}