00419nas a2200157   4500000000100000008004100001100001700042700001300059700001400072700001400086700001800100700002200118700002000140245008700160022001400247       2018                            d1 aC. Rebordosa1 aE. Plana1 aJ. Aguado1 aS. Thomas1 aE. Garcia-Gil1 aS. Perez-Gutthann1 aJ. Castellsague00aGOLD assessment of COPD severity in the Clinical Practice Research Datalink (CPRD)  a1053-8569