RT Journal Article SR Electronic T1 Choledochoduodenal fistula complicating chronic duodenal ulcer in Nigerians. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 146 OP 149 DO 10.1136/gut.10.2.146 VO 10 IS 2 A1 Lewis, E A A1 Bohrer, S P YR 1969 UL http://gut.bmj.com/content/10/2/146.abstract AB