pulmonary fibrosis and exercisepulmonary fibrosis lung transplantpulmonary fibrosis exercise therapyinterstitial fibrosis lungnitrofurantoin pulmonary fibrosismethotrexate pulmonary fibrosisprogressive pulmonary fibrosispulmonary fibrosis prognosisidiopathic lung fibrosissevere pulmonary fibrosischronic pulmonary fibrosisamiodarone pulmonary fibrosis