CITATION STYLE
Guyatt, G. H., Oxman, A. D., Sultan, S., Glasziou, P., Akl, E. A., Alonso-Coello, P., … Schünemann, H. J. (2011). GRADE guidelines: 9. Rating up the quality of evidence. Chinese Journal of Evidence-Based Medicine, 11(12), 1459–1463.
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