1. Systematic reviews: CRD’s guidance for undertaking reviews in health care;Centre for Reviews and Dissemination,2008
2. de Vet HC, Eisinga A, Riphagen I, Aertgeerts B, Pewsner D. Chapter 7: searching for studies. In: Cochrane handbook for systematic reviews of diagnostic test accuracy. The Cochrane Collaboration. Available at http://www.ncbi.nlm.nih.gov/pubmed/18693947.
3. In search of the evidence;Booth;Health Info Libr J,2003
4. How to identify randomized controlled trials in MEDLINE: ten years on;Glanville;J Med Libr Assoc,2006
5. Optimal search strategies for retrieving scientifically strong studies of treatment from Medline: analytical survey;Haynes;BMJ,2005