References

Petri N, Borgå O, Nyberg L, Hedeland M, Bondesson U, Lennernäs H: Effect of erythromycin on the absorption of fexofenadine in the jejunum, ileum and colon determined using local intubation in healthy volunteers. Int J Clin Pharmacol Ther 2006;44:71-79.
                                                    
Nyberg L, Månsson W, Abrahamsson B, Seidegård J, Borgå O. A convenient method for local drug administration at predefined sites in the entire gastrointestinal tract: Experiences from thirteen phase I studies. Eur J Pharmaceut Sci 2007;30:432-440.
 
Seidegård J, Nyberg L, Borgå O. Presystemic elimination of budesonide in man when administered locally at different levels in the gut, with and without local inhibition by ketoconazole. Eur J Pharmaceut Sci 2008;35:264-270.