BMJ. 1999 Jun 26;318(7200):1715A. doi: 10.1136/bmj.318.7200.1715a.
BMJ (Clinical research ed.)
Gottlieb
PMID: 10381689 PMCID: PMC1116068 DOI: 10.1136/bmj.318.7200.1715a
[No abstract available.]