RT Journal Article SR Electronic T1 Treatment of achalasia. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 861 OP 861 DO 10.1136/gut.34.6.861-b VO 34 IS 6 A1 Banerjee, S A1 Pugh, S A1 Smith, P M YR 1993 UL http://gut.bmj.com/content/34/6/861.3.abstract AB