A multicenter validation of an endoscopic classification with narrow band imaging for gastric precancerous and cancerous lesions.

Pimentel-Nunes P, Dinis-Ribeiro M, Soares JB, Marcos-Pinto R, Santos C, Rolanda C, Bastos RP, Areia M, Afonso L, Bergman J, Sharma P, Gotoda T, Henrique R, Moreira-Dias L.
Endoscopy. 2012 Mar;44(3):236-46.