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Observational versus randomised trial evidence
Debbie A Lawlor, George Davey Smith, K Richard Bruckdorfer, Devi Kundu, Shah EbrahimVolume:
364
Year:
2004
Language:
english
DOI:
10.1016/s0140-6736(04)16926-2
File:
PDF, 36 KB
english, 2004