@misc{indiciae6785fbfeb50b,
  title = {The rectosigmoid index.},
  author = {M J Siegel and G D Shackelford and W H McAlister},
  year = {1981},
  doi = {10.1148/radiology.139.2.7220897},
  url = {https://pubmed.ncbi.nlm.nih.gov/7220897/},
  note = {Source identifier: 7220897}
}