@misc{indiciae965fac69caaa,
  title = {Cigarette smoking in pregnancy results in marked decrease in maternal hCG and oestradiol levels.},
  author = {L Bernstein and M C Pike and R A Lobo and R H Depue and R K Ross and B E Henderson},
  year = {1989},
  doi = {10.1111/j.1471-0528.1989.tb01582.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2923845/},
  note = {Source identifier: 2923845}
}