@misc{indiciaefebcd004a7c7,
  title = {[ABO blood group advanced age].},
  author = {W Keil and I Bittner and B Kaiser and R Bartels and B Theodor},
  year = {1982},
  url = {https://pubmed.ncbi.nlm.nih.gov/7148024/},
  note = {Source identifier: 7148024}
}