@misc{indiciaec6dbc3ba64cb,
  title = {Graded exercise testing in patients with sinus node dysfunction.},
  author = {J A Abbott and D S Hirschfeld and F W Kunkel and M M Scheinman and G Modin},
  year = {1977},
  doi = {10.1016/0002-9343(77)90829-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/842552/},
  note = {Source identifier: 842552}
}