Optimal search strategies for detecting health services research studies in MEDLINE
Canadian Medical Association Journal (2004) - Comments
pubmed: 15534310  doi: 10.1503/cmaj.1040512  issn: 0820-3946  issn: 1488-2329 

Nancy L Wilczynski, R Brian Haynes, John N Lavis, Ravi Ramkissoonsingh, Alexandra E Arnold-Oatley,