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Bibliography:PMID:3125918
ark:/67375/NVC-1L1Z6H8P-S
istex:DB93640A6D48D2835018C80FBE3A464FFAF898B3
href:bmj-296-396.pdf
local:bmj;296/6619/396
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0267-0623
0959-8138
1468-5833
DOI:10.1136/bmj.296.6619.396