Users’ Guides to the Medical Literature: IX. A Method for Grading Health Care Recommendations

Gordon H. Guyatt, David L. Sackett, John C. Sinclair, Robert Hayward, Deborah J. Cook, Richard J. Cook, Eric Bass, Hertzel Gerstein, Brian Haynes, Anne Holbrook, Roman Jaeschke, Andreas Laupacls, Virginia Moyer, Mark Wilson