Obstetric anesthesia and concepts of placental transport: a historical review of the nineteenth century.
D000769:Anesthesia, Inhalation / Q000266:history*; D000773:Anesthesia, Obstetrical / Q000266:history*; D005060:Europe; D005260:Female; D006666:History of Medicine; D006801:Humans; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D014481:United States