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11.

GRADE guidelines: 3. Rating the quality of evidence
by Balshem, Howard

Journal of clinical epidemiology, 2011, Vol.64 (4), p.401-406

15.

GRADE guidelines: 9. Rating up the quality of evidence
by Guyatt, Gordon H

Journal of clinical epidemiology, 2011, Vol.64 (12), p.1311-1316

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