@misc{indiciae7120c647726c,
  title = {Combining 2 x 2 tables that contain structural zeros.},
  author = {W D Johnson and W L May},
  year = {1995},
  doi = {10.1002/sim.4780141706},
  url = {https://pubmed.ncbi.nlm.nih.gov/8532983/},
  note = {Source identifier: 8532983}
}