Effect of whey-based culture supernatant of Lactobacillus acidophilus (johnsonii) La1 on Helicobacter pylori infection in humans - Michetti, P.; Dorta, G.; Wiesel, P. H.; Brassart, D.; Verdu, E.; Herranz, M.; Felley, C.; Porta, N.; Rouvet, M.; Blum, A. L.; Corthesy-Theulaz, I. (1999)