BMJ. 1992 Jan 11;304(6819):65-6. doi: 10.1136/bmj.304.6819.65.
BMJ (Clinical research ed.)
J Winer
PMID: 1737137 PMCID: PMC1881022 DOI: 10.1136/bmj.304.6819.65 Free PMC Article
[No abstract available.]