[Is Helicobacter pylori infection the etiology of duodenal ulcer?].
Z X
ZX
Li
H T
HT
Yang
W D
WD
Zhang
D Y
DY
Zhou
D002681:China / Q000453:epidemiology; D004381:Duodenal Ulcer / Q000453:epidemiology / Q000382:microbiology*; D016481:Helicobacter Infections / Q000453:epidemiology; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans