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Journal of the National Cancer Institute Advance Access published online on June 22, 2009
JNCI Journal of the National Cancer Institute, doi:10.1093/jnci/djp155
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© The Author 2009. Published by Oxford University Press.

CORRESPONDENCE

Response

Deborah J. Del Junco, Sally W. Vernon, Sharon P. Coan

Affiliations of authors: Center for Clinical and Translational Science (DJDJ) and Division of Health Promotion and Behavioral Sciences, School of Public Health (SWV, SPC), University of Texas Health Sciences Center, Houston, TX

Correspondence to: Deborah J. del Junco, PhD, Center for Clinical and Translational Science, University of Texas Health Science Center, 6410 Fannin St, Ste 1100.27, Houston, TX 77030 (e-mail: deborah.j.deljunco@uth.tmc.edu).

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We appreciate the opportunity to respond to the three comments of McCambridge et al. regarding our article (1). Our specific responses follow this general observation: Ever since the landmark efforts of Campbell and Stanley (2) to develop a classification system for characteristics of human research studies that can weaken causal inferences, a few characteristics . . . [Full Text of this Article]


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