PGI9 RESPONSIVENESS TO CHANGE AND ENGLISH LANGUAGE VALIDATION OF THE WPAI-GERD QUESTIONNAIRE-RESULTS FROM A CANADIAN STUDY
Abstract
Authors
P Wahlqvist G Guyatt D Armstrong P Austin A Barkun N Chiba A deglInnocenti S El-Dika C Fallone D Heels-Ansdell L Tanser S Veldhuyzen van Zanten I Wiklund H Schnemann