Low-dose Ketamine Improves Pain Relief in Patients Receiving Intravenous Opioids for Acute Pain in the Emergency Department: Results of a Randomized, Double-blind, Clinical Trial La Ketamina a Dosis Bajas Mejora el Alivio del Dolor en Pacientes que Reciben Opiáceos Intravenosos para el Dolor Agudo en el Servicio de Urgencias: Resultados de un Ensayo Clínico Aleatorizado Doble Ciego

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