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APA Citation
Mary, J. Y., & Modigliani, R. (1989). development and validation of an endoscopic index of the severity for Crohn's disease: a prospective multicentre study. Groupe d'Etudes Thérapeutiques des Affections Inflammatoires du Tube Digestif (GETAID).. Gut, 30(7), 983–989. http://access.bl.uk/ark:/81055/vdc_100137785322.0x000050