Hubungan fraksi dan rasio CD4/CD8 cairan bronchoalveolar lavage terhadap status ekstubasi dan status mortalitas pada pasien pneumonia berat di RSUPN Dr. Cipto Mangunkusumo = Association between fraction and ratio of CD4/CD8 bronchoalveolar lavage fluid toward extubation status and mortality status of pneumonia severe patient in Dr. Cipto Mangunkusumo National General Hospital, Indonesia