Maryam Nakhshab, Mohammadreza Mahdavi, Mohammadreza Rafati, Mustafa Sharifi, Vagihe Ghaffari,

parisa adimi naghan chronic respiratory disease research center, national research institute of tuberculosis and lung disease, masih daneshvari hospital, shahid beheshti university of medical sciences, tehran, iran. majid malekmohammad tracheal diseases research center, national research institute of tuberculosis and lung diseases (nritld), shahid beheshti university of medical sciences, tehran, iran. hamidreza jamaati tobacco prevention and control research center, national research institute of tuberculosis and lung diseases (nritld), shahid beheshti university of medical sciences,tehran, iran. babak sharifkashani lung transplantation research center, national research institute of tuberculosis and lung diseases (nritld), shahid beheshti university of medical sciences, tehran, iran. arvin najafi chronic respiratory diseases research center, national research institute of tuberculosis and lung diseases (nritld), shahid beheshti university of medical sciences, tehran, iran. seyed mohammadreza hashemian chronic respiratory diseases research center, national research institute of tuberculosis and lung diseases (nritld), shahid beheshti university of medical sciences, tehran, iran.