American Journal of Epidemiology Advance Access originally published online on June 4, 2009
American Journal of Epidemiology 2009 170(3):288; doi:10.1093/aje/kwp138
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American Journal of Epidemiology © The Author 2009. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.
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Gardarsdottir et al. Respond to "Assessing Treatment Effects With Observational Analyses"
Correspondence to Dr. Eibert R. Heerdink, Division of Pharmacoepidemiology and Pharmacotherapy, Faculty of Science, Utrecht University, PO Box 80 082, 3508 TB Utrecht, The Netherlands (e-mail: e.r.heerdink@uu.nl).
Received for publication April 22, 2009. Accepted for publication April 28, 2009.
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We thank Drs. Wang and Schoenbaum (1) for their thoughtful comments on our study (2) on immortal and
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