@misc{indiciaee6c5807f8fd9,
  title = {Metformin and B 12 malabsorption.},
  author = {G H Tomkin},
  year = {1972},
  doi = {10.7326/0003-4819-76-4-668\_1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4640327/},
  note = {Source identifier: 4640327}
}