@misc{indiciaece0aef7159be,
  title = {[Letter: "Seroconversion rate" after influenza immunization].},
  author = {O Günther and D Seinsche and A von Mettenheim},
  year = {1974},
  url = {https://pubmed.ncbi.nlm.nih.gov/4599075/},
  note = {Source identifier: 4599075}
}