(Q35573082)
Statements
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Use of the General Practice Research Database (GPRD) for respiratory epidemiology: a comparison with the 4th Morbidity Survey in General Practice (MSGP4). (English)
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Hansell A
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Hollowell J
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Nichols T
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McNiece R
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Strachan D
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1 May 1999
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54
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5
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413-419
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Identifiers
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