@misc{indiciae20baf352cdbb,
  title = {Urinary estriol determinations in normal and pathological pregnancies.},
  author = {K Ryu and S O Chung and Y H Yang and H M Kwak},
  year = {1977},
  doi = {10.3349/ymj.1977.18.2.123},
  url = {https://pubmed.ncbi.nlm.nih.gov/617245/},
  note = {Source identifier: 617245}
}