Users' guides to the medical literature. VI. How to use How to use a clinical decision analysis. How to use articles about clinical decision rules.Users ' guides to the medical literature : XXII . How to use articles about clinical decision rules : EvidenceBased Medicine Working Group . JAMA . Users' guides to the medical literature: XXII: how to use articles about clinical decision rules. Evidence- Based Medicine Working Group. JAMA, 284, 79–84. JAMA 275:554-558 Guyatt GH, Naylor CD, Juniper E et al (1997) Users' guides to the medical literature. XII. How to use articles about health-related quality