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Abstract
Mesh: See more » Clinical Trials as TopicHealth Services Research/economicsHumansState Medicine/economicsUnited Kingdom
Year: 1994 PMID: 7950539 PMCID: PMC2540795 DOI: 10.1136/bmj.309.6956.741a
Source DB: PubMed Journal: BMJ ISSN: 0959-8138