A highly accurate method for monitoring histological recovery in patients with celiac disease on a gluten-free diet using an endoscopic approach that avoids the need for biopsy: a double-center study - Cammarota, G; Cuoco, L; Cesaro, P; Santoro, L; Cazzato, A; Montalto, M; La Mura, R; Larocca, L M; Vecchio, F M; Gasbarrini, A; Salvagnini, M; Gasbarrini, G (Endoscopy, 2007)