Description
Bibliography:ark:/67375/NVC-H31G7D1P-J
local:bmj;4/5885/147
PMID:4543103
href:bmj-4-147.pdf
istex:A67BD9B33C108590B98ED1C3524AAAF18AED4965
ISSN:0007-1447
1468-5833
DOI:10.1136/bmj.4.5885.147