RT Journal Article SR Electronic T1 Gastric mucosal competence and its role in the etiology of peptic ulcers JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 483 OP 488 VO 99 IS 10 A1 G. K. Wlodek YR 1968 UL http://www.cmaj.ca/content/99/10/483.abstract