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Bibliography:ark:/67375/NVC-0JSNCS2B-5
PMID:4397173
istex:3642AABAB596BA8096939189D1858107C363C0B9
href:bmj-2-652-2.pdf
local:bmj;2/5762/652-b
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0007-1447
1468-5833
DOI:10.1136/bmj.2.5762.652-b