@misc{indiciae078644ee0e8d,
  title = {ABO blood groups and gastrointestinal function.},
  author = {M J Langman},
  year = {1970},
  doi = {10.1136/gut.11.9.796},
  url = {https://pubmed.ncbi.nlm.nih.gov/4249194/},
  note = {Source identifier: 4249194}
}