interstitial lung disease history signs symptoms ongoing time informed consent 
pulmonary obstructive copd chronic disease severe lung asthma requiring oxygen 
pneumonitis history induced active ongoing drug years radiation confirmed patients 
ild interstitial lung pneumonitis history disease induced evidence active drug 
severely lung impaired function interstitial concurrent condition severity history judged 
interstitial pneumonitis lung history disease active requiring patients radiation clinically 
interstitial lung evidence disease clinically history asymptomatic active patients dyspnea 
cardiac disease arrhythmia history shunts patients known condition active requiring 
noninfectious pneumonitis interstitial evidence lung history active steroids required disease