Absorption enhancers in nasal insulin delivery and their influence on nasal ciliary functioning Schipper, N.G.M.; Verhoef, J.; Romeijn, S.G.; Merkus, F.W.H.M. Journal of Controlled Release 21(1-3): 173-186 1992 0168-3659 10.1016/0168-3659(92)90019-n https://eurekamag.com/research/029/846/029846221.php