1. Berroteran A, Perrone M, Correnti M et al (2002) Detection of Helicobacter pylori DNA in the oral cavity and gastroduodenal system of a Venezuelan population. J Med Microbiol 51:764–770
2. Bielański W (1999) Epidemiological study on Helicobacter pylori infection and extragastroduodenal disorders in Polish population. J Physiol Pharmacol 50:723–733
3. Chitsazi MT, Fattahi E, Farahani RM, Fattahi S (2006) Helicobacter pylori in the dental plaque: is it of diagnostic value for gastric infection? Med Oral Patol Oral Cir Bucal 11:325–328
4. Czesnikiewicz-Guzik M, Bielanski W, Guzik TJ et al (2005) Helicobacter pylori in the oral cavity and its implications for gastric infection, periodontal health, immunology, and dyspepsia. J Physiol Pharmacol 56:77–89
5. De Sousa L, Vásquez L, Velasco J, Parlapiano D (2006) Isolation of Helicobacter pylori in gastric mucosa, dental plaque, and saliva in a population from the Venezuelan Andes. Invest Clin 47:109–116