Comparison of metronidazole susceptibility testing by agar dilution, disk diffusion and epsilometer test in Helicobacter pylori (Hp) isolates. - Perna, F.; Gatta, L.; Figura, N.; Holton, J.; Osborn, J.; Ricci, C.; Tampieri, A.; Miglioli, M.; Vaira, D. (Gut (0017-5749), 2002)