RT Journal Article SR Electronic T1 Diagnosis of oesophageal spasm by ergometrine provocation JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 683 OP 683 DO 10.1136/gut.24.7.683 VO 24 IS 7 A1 H Alban Davies A1 M D Kaye A1 J Rhodes A1 A M Dart A1 A Henderson YR 1983 UL http://gut.bmj.com/content/24/7/683.1.abstract AB