@misc{indiciae22d3099e68a6,
  title = {[P wave changes after exercise in patients with mitral stenosis].},
  author = {M Yokoyama and M Nogi},
  year = {1972},
  url = {https://pubmed.ncbi.nlm.nih.gov/5042003/},
  note = {Source identifier: 5042003}
}