Glossopharyngeal Nerve Block versus Lidocaine Spray to Improve Tolerance in Upper Gastrointestinal Endoscopy by Moisés Ortega Ramírez, Benigno Linares Segovia, Marco Antonio García Cuevas, Jorge Luis Sánchez Romero, Illich Botello Buenrostro, Norma Amador Licona, Juan Manuel Guízar Mendoza, Jesús Francisco Guerrero Romero, Víctor Manuel Vázquez Zárate

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