1. Cochrane handbook for systematic reviews of interventions [Internet]. Version 5.1.0 [updated March 2011],2011
2. Systematic Reviews: CRD's guidance for undertaking reviews in health care [Internet],2009
3. Clinical practice guidelines we can trust,2011
4. Methodological Expectations of Cochrane Intervention Reviews (MECIR): methodological standard for the conduct of new Cochrane Intervention Reviews;Chandler,2012
5. Finding what works in health care: standards for systematic reviews,2011