Physical Activity Is Associated with Attenuated Disease Progression in Chronic Obstructive Pulmonary Disease

Heleen Demeyer, David Donaire-Gonzalez, Elena Gimeno-Santos, Maria A. Ramon, Jordi De Battle, Marta Benet, Ignasi Serra, Stefano Guerra, Eva Farrero, Esther Rodriguez, Jaume Ferrer, Jaume Sauleda, Eduard Monso, Joaquim Gea, Roberto Rodriguez-Roisin, Alvar Agusti, Josep M. Antó, Judith Garcia-Aymerich