00506nas a2200169   4500000000100000000000100001008004100002100001600043700001300059700001400072700001600086700001600102245018600118300001200304490000600316022001400322       2019                            d1 aA. Mitchell1 aT. Welsh1 aM. Watson1 aJ. Snowball1 aA. McGrogan00aUse of oral anticoagulants in older people with atrial fibrillation in UK general practice: protocol for a cohort study using the Clinical Practice Research Datalink (CPRD) database  ae0326460 v9  a2044-6055