Abstract
. La etiologia de este amplio grupo (masde 150 procesos) de enfermedades es, en la mayoria delos casos, desconocida, ya que solo en el 35% de ellases posible identificar el agente causal. La clasificacionde estas enfermedades se ha visto sujeta a numerosasrevisiones, aceptandose en la actualidad la elaboradapor consenso entre la American Thoracic Society (ATS)y la European Respiratory Society (ERS)
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