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Bibliography:local:bmj;3/5670/569
PMID:5803690
istex:BF626089C275E44BD4B6795EA0D1B4800C7A3CA3
ark:/67375/NVC-BDHTRRTZ-W
href:bmj-3-569.pdf
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0007-1447
1468-5833
DOI:10.1136/bmj.3.5670.569