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APA Citation
Guyatt, G., Vist, G., Falck-Ytter, Y., Kunz, R., Magrini, N., & Schunemann, H. (2006). an emerging consensus on grading recommendations?. Evidence-based medicine, 11(1), 2–4. http://access.bl.uk/ark:/81055/vdc_100177574121.0x000001