a number of patients with scleroderma , sjogren 's syndrome and other connective tissue diseases ( ctd ) were assessed to ascertain the prevalence of respiratory abnormalities as defined by bronchoalveolar lavage ( bal ) , standard respiratory function studies and gallium scan of the lung , and the relationship of these abnormalities to the presence or absence of dyspnea .
C0035203
respiratory
C0024109
lung