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Obstetrics and Gynecology International
Volume 2012 (2012), Article ID 148616, 16 pages
http://dx.doi.org/10.1155/2012/148616
Review Article

The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome

Tornblad Institute, Lund University, 223 62 Lund, Sweden

Received 12 August 2011; Accepted 29 August 2011

Academic Editor: Gideon Koren

Copyright © 2012 Bengt Källén. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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