RT Journal Article SR Electronic T1 Is Repeat Testing Needed for Helicobacter pylori? JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 449 OP 450 DO 10.3122/15572625-13-6-449 VO 13 IS 6 A1 Robert D. Zipser A1 Meghal V. Parikh YR 2000 UL http://www.jabfm.org/content/13/6/449.abstract AB