GC	Gastric cancer
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PROSPERO	International Prospective Register of Systematic Reviews
RSCI	Russian Science Citation Index
NOS	Newcastle–Ottawa scale
H. Pylori	Helicobacter pylori
CI	Confidence interval
MRSA	Methicillin-resistant Staphylococcus aureus
WHO	World Health Organization
IARC	International Agency for Research on Cancer
MALT	Mucosa-associated lymphoid tissue
Hp-EuReg	Helicobacter pylori European Registry
ET	Eradication therapy
PPI	Proton pump inhibitor