00451nas a2200157   4500000000100000000000100001008004100002100001500043700001700058700001400075700001300089245015700102300001200259490000800271022001400279       2018                            d1 aK. Rothnie1 aH. Mullerova1 aL. Smeeth1 aJ. Quint00aNatural History of Chronic Obstructive Pulmonary Disease Exacerbations in a General Practice-based Population with Chronic Obstructive Pulmonary Disease  a464-4710 v198  a1073-449x