External validation of a classification for methylene blue magnification chromoendoscopy in premalignant gastric lesions by Areia, Miguel, MD, Amaro, Pedro, MD, Dinis-Ribeiro, Mário, PhD, Cipriano, Maria Augusta, MD, Marinho, Carol, MD, Costa-Pereira, Altamiro, PhD, Lopes, Carlos, PhD, Moreira-Dias, Luís, PhD, Romãozinho, José Manuel, PhD, Gouveia, Hermano, MD, Freitas, Diniz, PhD, Leitão, Maximino Correia, PhD

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