@base . a , ; "Helicobacter pylori and gastroduodenal disease" . . a ; . a . a ; "0916-7161" ; . a ; ; "20041117030900.0"^^ ; ; . "Japan" . a , , ; , , ; "Helicobacter pylori and gastroduodenal disease." ; ; ; "0916-7161" ; ; "0916-7161" ; ; "0916-7161" ; "Helicobacter pylori and gastroduodenal disease" , "Helicobacter pylori and gastroduodenal disease." ; . a ; "0916-7161" ; .