Description
Bibliography:local:bmj;2/5410/670
href:bmj-2-670.pdf
PMID:14171098
istex:F91DE70516B94BFC06D1ED45EADA14FB0267ED63
ark:/67375/NVC-SDNMMRDH-T
ISSN:0007-1447
1468-5833
DOI:10.1136/bmj.2.5410.670