| | Focus on nonexperimental approachesNo abstract is available. To read the body of this article, please view the Full Text online. |
Editors, Institute for population Health - Centre for Global Health, University of Ottawa, 1 Stewart Street, Ottawa, Ontario, Canada K1N 6N5 PII: S0895-4356(09)00292-3 doi:10.1016/j.jclinepi.2009.09.003 © 2009 Elsevier Inc. All rights reserved. | |
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