Efficacy and Tolerability of Two Quadruple Regimens: Bismuth, Omeprazole, Metronidazole with Amoxicillin or Tetracycline as First-Line Treatment for Eradication of Helicobacter Pylori in Patients with Duodenal Ulcer: A Randomized Clinical Trial - Salmanroghani, H; Mirvakili, M; Baghbanian, M; Salmanroghani, R; Sanati, G; Yazdian, P (PLoS One, 2018)