The authors regret that in the original version of their paper, Hong Jiang was inadvertently omitted from the author list. The corrected author list appears above. H. Jiang's affiliation is Department of Neurology, Hope Center for Neurological Disorders, Charles F. and Joanne Knight Alzheimer's Disease Research Center, Washington University, St. Louis, MO 63110. This has been corrected in the online HTML and PDF versions. The error remains only in the print version.