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Bibliography:PMID:13941621
istex:E4BAF63AE554839171F1EEEF3715312AEFBF6D80
href:bmj-1-89.pdf
local:bmj;1/5323/89
ark:/67375/NVC-TBBFHVTH-K
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0007-1447
1468-5833
DOI:10.1136/bmj.1.5323.89