Functional Foods Forum, Faculty of Medicine, University of Turku, 20520 Turku, Finland. Danone Nutricia Research, 3584 CT Utrecht, The Netherlands. Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CG Utrecht, The Netherlands. Instituto de Lactología Industrial (INLAIN, UNL-CONICET), Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, Santa Fe 3000, Argentina. Department of Paediatrics at the Medical University of Warsaw, 02091 Warsaw, Poland.