RT Journal Article SR Electronic T1 Helicobacter pylori: the African enigma. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 429 OP 431 DO 10.1136/gut.33.4.429 VO 33 IS 4 A1 Holcombe, C YR 1992 UL http://gut.bmj.com/content/33/4/429.abstract AB