Glucagon-like peptide 1 (7-36 amide) secretion in response to luminal sucrose from the upper and lower gut. A study using alpha-glucosidase inhibition (acarbose) - Qualmann, C; Nauck, M A; Holst, J J; Orskov, C; Creutzfeldt, W (Scand J Gastroenterol, 1995)