@misc{indiciaeb1309382151c,
  title = {Procainamide-induced urticarial vasculitis.},
  author = {J P Knox and S E Welykyj and R Gradini and M C Massa},
  year = {1988},
  url = {https://pubmed.ncbi.nlm.nih.gov/2973973/},
  note = {Source identifier: 2973973}
}