Radiofrequency ablation is effective for the treatment of high-grade dysplasia in Barrett’s esophagus after failed photodynamic therapy - Dunn, J. M.; Banks, M. R.; Oukrif, D.; Mackenzie, G. D.; Thorpe, S.; Rodriguez-Justo, M.; Winstanley, A.; Bown, S. G.; Novelli, M. R.; Lovat, L. B. (Endoscopy, 2011)