00481nas a2200181   4500000000100000000000100001008004100002100001500043700001300058700001400071700001700085700001400102700001500116245014000131300000700271490000700278022001400285       2019                            d1 aM. Pikoula1 aJ. Quint1 aF. Nissen1 aH. Hemingway1 aL. Smeeth1 aS. Denaxas00aIdentifying clinically important COPD sub-types using data-driven approaches in primary care population based electronic health records  a860 v19  a1472-6947