cagA positive and negative Helicobacter pyloristrains are simultaneously present in the stomach of most patients with non-ulcer dyspepsia: relevance to histological damage
N Figura, C Vindigni, A Covacci, L Presenti, D Burroni, R Vernillo, T Banducci, F Roviello, D Marrelli, M Biscontri, S Kristodhullu, C Gennari, D Vaira
Gut Jun 1998, 42 (6) 772-778; DOI: 10.1136/gut.42.6.772