Comparison of 10 day bismuth quadruple therapy with high-dose metronidazole or levofloxacin for second-line Helicobacter pylori therapy: a randomized controlled trial.
Kuo CH, Hsu PI, Kuo FC, Wang SS, Hu HM, Liu CJ, Chuah SK, Chen YH, Hsieh MC, Wu DC, Tseng HH. Comparison of 10 day bismuth quadruple therapy with high-dose metronidazole or levofloxacin for second-line Helicobacter pylori therapy: a randomized controlled trial. J Antimicrob Chemother. 2013 Jan; 68(1):222-8.