Validity of Serum Pepsinogen I/II Ratio for the Diagnosis of Gastric Epithelial Dysplasia and Intestinal Metaplasia during the Follow-Up of Patients at Risk for Intestinal-Type Gas... by Mário Dinis-Ribeiro, Altamiro da Costa-Pereira, Carlos Lopes, Joana Barbosa, Mateus Guilherme, Luís Moreira-Dias, Helena Lomba-Viana, Rui Silva, Nuno Abreu, Rafael Lomba-Viana

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