COPD management as a model for all chronic respiratory conditions: report of the 4th Consensus Conference in Respiratory Medicine oleh Stefano Nardini, Fernando De Benedetto, Claudio M. Sanguinetti, Salvatore Bellofiore, Stefano Carlone, Salvatore Privitera, Luciano Sagliocca, Emmanuele Tupputi, with the collaboration of The Consensus Conference Group