Effects of Iberogast on proximal gastric volume, antropyloroduodenal motility and gastric emptying in healthy men - Pilichiewicz, A N; Horowitz, M; Russo, A; Maddox, A F; Jones, K L; Schemann, M; Holtmann, G; Feinle-Bisset, C (Am J Gastroenterol, 2007)