Narrow band imaging versus lugol chromoendoscopy to diagnose squamous cell carcinoma of the esophagus: a systematic review and meta-analysis - Morita, Flavio Hiroshi Ananias; Bernardo, Wanderley Marques; Ide, Edson; Rocha, Rodrigo Silva Paula; Aquino, Julio Cesar Martins; Minata, Mauricio Kazuyoshi; Yamazaki, Kendi; Marques, Sergio Barbosa; Sakai, Paulo; Moura, Eduardo Guimarães Hourneaux de (BMC Cancer, 2017)