@misc{indiciaeadf00093a353,
  title = {Letter: Local immunity and ulcerative colitis.},
  author = {K Baklien and P Brandtzaeg},
  year = {1974},
  doi = {10.1016/s0140-6736(74)91796-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/4136940/},
  note = {Source identifier: 4136940}
}