@misc{indiciaea0dceb8f8eca,
  title = {Does unexplained second-trimester (15 to 20 weeks' gestation) maternal serum alpha-fetoprotein elevation presage adverse perinatal outcome? Pitfalls and preliminary studies with late second- and third-trimester maternal serum alpha-fetoprotein.},
  author = {J L Simpson and S Elias and C D Morgan and R N Andersen and L P Shulman and B M Sibai and B M Mercer and A Skoll},
  year = {1991},
  doi = {10.1016/0002-9378(91)90525-v},
  url = {https://pubmed.ncbi.nlm.nih.gov/1706141/},
  note = {Source identifier: 1706141}
}