Comparison of two questionnaires which measure the health-related quality of life of idiopathic pulmonary fibrosis patients - Zimmermann, C. S.; Carvalho, C. R. F.; Silveira, K. R.; Yamaguti, W. P. S.; Moderno, E. V.; Salge, J. M.; Kairalla, R A.; Carvalho, C. R. R. (Brazilian journal of medical and biological research, 2007)