@book{circref2460,
title = {Undertaking systematic reviews of research on effectiveness : CRD’s guidance for those carrying out or commissioning reviews},
booktitle = {Series: CRD report ; 4},
author = {NHS Centre for Reviews and Dissemination.},
publisher = {Centre for Reviews and Dissemination, University of York},
year = {2001},
address = {York, England},
url = {},
keywords = {Health Care, Health Services Research, Quality Assurance}
}