RT Journal Article SR Electronic T1 A surprising hyperpigmentation of the gums and tongue JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1697 OP 1697 DO 10.1136/gut.2008.160184 VO 57 IS 12 A1 S Dell’Isola A1 A M Ialungo A1 G Starnini A1 P Roselli A1 G Ghittoni A1 E Caturelli YR 2008 UL http://gut.bmj.com/content/57/12/1697.abstract AB