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Special article
Clinical ultrasonography in chronic obstructive pulmonary disease
a Grupo de Trabajo de Ecografía Clínica, Sociedad Española de Medicina Interna, Servicio de Medicina Interna, Hospital Universitario Infanta Cristina, Parla, Madrid, Spain
b Grupo de Trabajo de EPOC, Sociedad Española de Medicina Interna, Servicio de Medicina Interna, Hospital General Universitario de Elche, Elche, Alicante, Spain



