1. Agency for Healthcare Research and Quality Effective Health Care Program (DEcIDE Research Network): Third Symposium on Comparative Effectiveness Research Methods. Methods for developing and analyzing clinically rich data for patient-centered outcomes research 2011 http://www.effectivehealthcare.ahrq.gov/index.cfm/update-on-the-third-symposium-on-comparative-effectiveness-research-methods-june-6-72011/
2. National Institutes of Health Definition of Clinical Research: Patient-oriented research http://grants.nih.gov/grants/funding/women_min/training/tsld007.htm
3. Evidence-based medicine: A new approach to teaching the practice of medicine;Evidence-Based Medicine Working Group;JAMA,1992
4. Users' guide to the medical literature: IX. A method for grading health care recommendations;Guyatt;JAMA,1995