Letters to the Editor
Impact Factor: What Having One Means to a Scientific Journal
a Servicio de Neumología, Hospital General Básico de la Defensa de Valencia, Valencia, Spain
b Instituto de Historia de la Ciencia y Documentación López Piñero (Consejo Superior de Investigaciones Científicas-Universitat de Valencia), Facultad de Medicina, Valencia, Spain
c Servicio de Medicina Intensiva, Hospital General Básico de la Defensa de Valencia, Valencia, Spain
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