Edson Guzmán-Calderón1,2,3,4. 1. Gastroenterology Unit of the Hospital Nacional Edgardo Rebagliati Martins, Lima, Peru. edson_guzman@hotmail.com. 2. Universidad Peruana de Ciencias Aplicadas (UPC), Lima, Peru. edson_guzman@hotmail.com. 3. Universidad San Martin de Porres (USMP), Lima, Peru. edson_guzman@hotmail.com. 4. Gastroenterology Unit, Clinica Internacional, Lima, Peru. edson_guzman@hotmail.com.
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