Data collection barriers can be overcome by schemes such as MEDICS.
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Lamont
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Murphy
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Singleton
D003327:Coronary Disease / Q000628:therapy; D003625:Data Collection / Q000379:methods*; D004739:England; D005194:Family Practice / Q000379:methods*; D006801:Humans; D011785:Quality Assurance, Health Care / Q000379:methods