00379nas a2200157   4500000000100000008004100001100002000042700002100062700001900083700001800102700001400120245005400134300001200188490000700200022001400207       2016                            d1 aE. Merinopoulou1 aM. Raluy-Callado1 aS. Ramagopalan1 aS. MacLachlan1 aJ. Khalid00aCOPD exacerbations by disease severity in England  a697-7090 v11  a1176-9106