1. Cochrane Collaboration 2017 About The Cochrane Library http://www.cochranelibrary.com/about/about-the-cochrane-library.html
2. Evidence-based medicine;Collins;J Am Coll Radiol,2007
3. Elsvier BV 2017 Embase Fact Sheet https://www.elsevier.com/__data/assets/pdf_file/0016/59011/R_D_Solutions_Embase_Fact_Sheet-Web.pdf
4. How to identify randomized controlled trials in MEDLINE: ten years on;Glanville;J Med Libr Assoc,2006
5. Lefebvre C Manheimer E Glanville J 2009 Searching for studies Higgins JPT Green S Cochrane Handbook for Systematic Reviews of Interventions http://handbook.cochrane.org/