@misc{indiciae943688ceadb4,
  title = {Serum cobalamin concentrations during TPN.},
  author = {J P Van Spreeuwel},
  doi = {10.1177/0148607187011001103},
  url = {https://pubmed.ncbi.nlm.nih.gov/3102771/},
  note = {Source identifier: 3102771}
}