Si, Xiao-Bei, et al. “Gastric Juice-Based Genotypic Methods for Diagnosis of Helicobacter Pylori Infection and Antibiotic Resistance Testing: A Systematic Review and Meta-Analysis”. Turkish Journal of Gastroenterology, vol. 32, no. 1, Jan. 2021, pp. 53-65, doi:10.5152/tjg.2020.20025.