Martin Gardner. Show Affiliations »
Abstract
Mesh: See more » ClassificationCross-Over StudiesMedical Informatics/standards
Year: 2003 PMID: 12763958 PMCID: PMC514031 DOI: 10.1136/bmj.326.7399.1101
Source DB: PubMed Journal: BMJ ISSN: 0959-8138