@misc{indiciae412add8c4d4d,
  title = {Aging changes in the human sinoatrial node.},
  author = {M LEV},
  year = {1954},
  doi = {10.1093/geronj/9.1.1},
  url = {https://pubmed.ncbi.nlm.nih.gov/13130870/},
  note = {Source identifier: 13130870}
}