"GOLD or lower limit of normal definition? a comparison with expert-based diagnosis of chronic obstructive pulmonary disease in a prospective cohort-study"
Gülmisal Güder, Susanne Brenner, Christiane E Angermann, Georg Ertl, Matthias Held, Alfred P Sachs, Jan-Willem Lammers, Pieter Zanen, Arno W Hoes, Stefan Störk and Frans H Rutten*