«…экология человеческого желудка заметно изменилась» (см. с. 121): M. J. Blaser, “Helicobacter pylori eradication and its implications for the future,” Alimentary Pharmacology and Therapeutics 11, suppl. 1 (1997): 103–7; “Not all Helicobacter pylori strains are created equal: should all be eliminated?” 349 Lancet (1997): 1020–22; “Helicobacters are indigenous to the human stomach: duodenal ulceration is due to changes in gastric microecology in the modern era,” Gut 43 (1998): 721–27; “In a world of black and white, Helicobacter pylori is gray,” Annals of Internal Medicine 130 (1999): 695–97.