Poor Results of 5-Aminolevulinic Acid-Photodynamic Therapy for Residual High-Grade Dysplasia and Early Cancer in Barrett Esophagus after Endoscopic Resection - Peters, F; Kara, M; Rosmolen, W; Aalders, M; ten Kate, F; Krishnadath, K; van Lanschot, J; Fockens, P; Bergman, J (Endoscopy, 2005)