| Literature DB >> 16439416 |
Johannes Berkhof, Folkert J van Kemenade, Peter J Snijders, René H Verheijen, Chris J Meijer.
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Year: 2006 PMID: 16439416 PMCID: PMC1352067 DOI: 10.1136/bmj.332.7535.237
Source DB: PubMed Journal: BMJ ISSN: 0959-8138