@misc{indiciae1cc0bf687ee6,
  title = {Heart block in polymyositis.},
  author = {H H Schaumburg and S L Nielsen and P M Yurchak},
  year = {1971},
  doi = {10.1056/nejm197103042840905},
  url = {https://pubmed.ncbi.nlm.nih.gov/5100422/},
  note = {Source identifier: 5100422}
}