@misc{indiciae8deb5c1dfa5e,
  title = {The private practice study group as phase-IV research tool.},
  author = {H Helmchen and M Linden and G Schüssler},
  year = {1984},
  doi = {10.1055/s-2007-1017429},
  url = {https://pubmed.ncbi.nlm.nih.gov/6494245/},
  note = {Source identifier: 6494245}
}