Translation, cross-cultural adaptation, reliability, and validity of the Turkish version of the Duke Activity Status Index in patients with pulmonary hypertension R. Mustafaoglu, R. Demir, G.K. Aslan, U.Y. Sinan, M. Zeren, A. Yildiz, M.S. Kucukoglu

Test-retest reliability, construct validity and determinants of 6-minute walk test performance in adult patients with asthma R. Meys, S.M.J. Janssen, F.M.E. Franssen, A.W. Vaes, A.A.F. Stoffels, H.W.H. van Hees, B. van den Borst, P.H. Klijn, C. Burtin, A.J. van 't Hul, M.A. Spruit

The COPD assessment test and the modified Medical Research Council scale are not equivalent when related to the maximal exercise capacity in COPD patients R. Pisi, M. Aiello, L. Calzetta, A. Frizzelli, P. Tzani, G. Bertorelli, A. Chetta