Noninvasive evaluation of intestinal lactase with 4-galactosylxylose: Comparison with 3-and 2-galactosylxylose and optimization of the method in rats - Martinez-Costa Perez, Oscar Hernan; Aragon Reyes, Juan Jose; Hermida, C; Corrales, G; Martinez-Costa, OH; Fernandez-Mayoralas, A; Aragon, JJ (Clinical Chemistry, 2006)