Evaluation of oro-coecal transit time: a comparison of the lactose-[13C, 15N]ureide 13CO2- and the lactulose H2-breath test in humans von Wutzke, K.D, Heine, W.E, Plath, C, Leitzmann, P, Radke, M, Mohr, C, Ritcher, I, Gulzow, H.U, Hobush, D

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