@misc{indiciaea739fd03b439,
  title = {Mongolism and maternal menarche.},
  author = {J M Berg and J T Bavin},
  year = {1969},
  doi = {10.1136/jmg.6.2.135},
  url = {https://pubmed.ncbi.nlm.nih.gov/4240720/},
  note = {Source identifier: 4240720}
}