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Correction

In the article “Increased Risk of Schizophrenia From Additive Interaction Between Infant Motor Developmental Delay and Obstetric Complications: Evidence From a Population-Based Longitudinal Study” by Mary C. Clarke, Ph.D., et al. (Epub ahead of print, September 2, 2011 [doi: 10.1176/appi.2011.11010011]), the affiliation for David A. Leon, Ph.D., is as follows: the London School of Hygiene and Tropical Medicine, London. This affiliation was added for the article's appearance in the December 2011 issue and for its online posting as part of that issue.