Oxygen and Antipyrene Diffusion During In Vitro Human Placental Perfusion Alex Robertson, John D. Trelford, Richard Nachman, Sofia Czekajewski and James Dearing J Extra Corpor Technol, 3 2 (1971) 6-9 Published online: 14 November 2023 DOI: 10.1051/ject/1971032006