Survival of L. rhamnosus GG (•), L. gasseri ATCC 33323 (□), L. salivarius UCC 500 (▵), L. rhamnosus E800 (♦), and L. paracasei NFBC 338 (▪) in simulated gastric juice, pH 2.0. The data are the means of triplicate experiments, and the error bars indicate standard deviations.