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Bibliography:href:bmj-305-313-1.pdf
Related-article-href:1628089
PMID:1392873
istex:62A9F0B75352763FEE5DC791B22B3F93F2DD4992
ark:/67375/NVC-V8Q72K90-C
related-article-ID:N0x98b2408N0x9fb7850
local:bmj;305/6848/313
ISSN:0959-8138
1468-5833
1756-1833
DOI:10.1136/bmj.305.6848.313