title: "Continuous fat-free mass decline in COPD: fact or fiction?" Erica P.A. Rutten, Martijn A. Spruit, Merry-Lynn N. McDonald, Stephen Rennard, Alvar Agusti, Bartolome Celli, Bruce E. Miller, Courtney Crim, Peter M.A. Calverley, Corrine Hanson, William MacNee, Frits M.E. Franssen, Lowie Vanfleteren and Emiel F.M. Wouters on behalf of the ECLIPSE (Evaluation of COPD Longitudinally to Identify Predictive Surrogate End-points) Investigators. Eur Respir J 2015; 46: 1496-1498.