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APA Citation
Guyatt, G. H., Oxman, A. D., Kunz, R., Jaeschke, R., Helfand, M., Liberati, A., Vist, G. E., & Schünemann, H. J. (2008). incorporating considerations of resources use into grading recommendations. BMJ, 336(7654), 1170–1173. http://access.bl.uk/ark:/81055/vdc_100181698211.0x00002f