1. Development and validation of an international appraisal instrument for assessing the quality of clinical practice guidelines: the AGREE project;Qual Saf Health Care,2003
2. Practice guidelines developed by specialty societies: the need for a critical appraisal;Grilli;Lancet,2000
3. A provisional instrument for assessing clinical practice guidelines. Guidelines for clinical practice: from development to use;Lohr,1992
4. Appraising clinical guidelines: towards a “which” guide for purchasers;Cluzeau;Qual Health Care,1994
5. International comparison of 19 clinical guideline programs—a survey of the AGREE Collaboration (in German);Burgers;Z Arztl Fortbild Qualitatssich,2003