A Randomized, Prospective Cross-Over Trial Comparing Methylene Blue-Directed Biopsy and Conventional Random Biopsy for Detecting Intestinal Metaplasia and Dysplasia in Barrett’s Esophagus - Ragunath, K; Krasner, N; Raman, V S; Haqqani, M T; Cheung, W Y (Endoscopy, 2003)