Dr. Kai Paul is a co-author of “In vitro models of the human placental barrier – In regione caecorum rex est luscus” in Nanotoxicology. http://www.tandfonline.com/doi/full/10.3109/17435390.2013.869628 following on from the authors publication released in 2013 “The toxicity, transport and uptake of nanoparticles in the in vitro BeWo b30 placental cell barrier model used within NanoTEST” http://www.tandfonline.com/doi/abs/10.3109/17435390.2013.833317