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Data sources and analysis populations. CPRD: Clinical Practice Research Datalink; EGPA: eosinophilic granulomatosis with polyangiitis; ICD: International Classification of Diseases; OPCS: Office of Population Censuses and Surveys's Classification of Surgical Operations and Procedures; A&E: accident and emergency; NHS: National Health Service. #: information from [24]; ¶: from 1997; +: from 2003; §: from 2007; ƒ: from 2012.
