Characteristics, stability and outcomes of the 2011 GOLD COPD groups in the ECLIPSE cohort
Alvar Agusti, Lisa D. Edwards, Bartolomé Celli, William MacNee, Peter M. A. Calverley, Hana Müllerova, David A. Lomas, Emiel Wouters, Per Bakke, Steve Rennard, Courtney Crim, Bruce E. Miller, Harvey O. Coxson, Julie C. Yates, Ruth Tal-Singer, Jørgen Vestbo
European Respiratory Journal Sep 2013, 42 (3) 636-646; DOI: 10.1183/09031936.00195212