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Bibliography:PMID:5920657
istex:8CA4028228CCB7CBF57D954FF8757A89C7619986
ark:/67375/NVC-K40MLB4X-5
href:bmj-2-342.pdf
local:bmj;2/5509/342
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SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0007-1447
1468-5833
DOI:10.1136/bmj.2.5509.342