@misc{indiciae9e9f76f184d3,
  title = {4-hydroxyestrone, isolation and identification in human urine.},
  author = {G Emons and H O Hoppen and P Ball and R Knuppen},
  year = {1980},
  doi = {10.1016/0039-128x(80)90069-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/7414657/},
  note = {Source identifier: 7414657}
}