See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/264726328 Proof-of-concept study on the suitability of 13C-urea as a marker substance for assessment of in vivo behaviour of oral... Article in British Journal of Pharmacology · September 2009 DOI: 10.1111/j.1476-5381.2009.00302.x CITATIONS 12 READS 20 8 authors, including: Gg Olsder University of Groningen 2 PUBLICATIONS 12 CITATIONS SEE PROFILE Henderik Frijlink University of Groningen 284 PUBLICATIONS 5,223 CITATIONS SEE PROFILE Jos G W Kosterink University of Groningen 140 PUBLICATIONS 1,883 CITATIONS SEE PROFILE Frans Stellaard University of Groningen 243 PUBLICATIONS 4,693 CITATIONS SEE PROFILE All content following this page was uploaded by Frans Stellaard on 27 November 2016. The user has requested enhancement of the downloaded file. All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.