Kim JY, Lee SY, Kim JH, Sung IK, et al. Efficacy and safety of twice a day, bismuth-containing quadruple therapy using
high-dose tetracycline and metronidazole for second-line Helicobacter pylori
eradication. Helicobacter 2020 Feb 19:e12683. doi: 10.1111/hel.12683.
PMID: 32074663