Effect of Proton Pump Inhibitors (PPI) and H2 Receptor Antagonists (H2RA) on Response to Therapy with Fidaxomicin or Vancomycin in Hospitalized Patients with Clostridium difficile Infection - Weiss, K; Louie, T; Miller, M; Mullane, K; Crook, D; Esposito, R; Gorbach, S (AMERICAN JOURNAL OF GASTROENTEROLOGY, 2011)