EFFICACY OF MACROSCOPIC ON SITE EVALUATION WITH HEPARINIZED FINE NEEDLE BIOPSY IN ENDOSCOPIC ULTRASOUND IN A HIGH VOLUME CENTER IN COSTA RICA: MOSE AND HISTOLOGICAL EVALUATION by Gonzalez-Ulloa, Adrian, Vargas-Navarro, Francisco, Ramirez- Quesada, Wagner E., Morales, Karina H., Guillen, Esteban Cob, González, Aldo Carvajal, Madrigal Méndez, Ana L., Cortes-Navarrete, Jose P., Gutierrez, Carolina, Vargas, Jorge

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