1. Duke-UNC Brain Imaging and Analysis Center, Duke University, Durham, North Carolina, USA.
2. Mid-Atlantic Mental Illness Research, Education and Clinical Center, Durham VA Medical Center, Durham, North Carolina, USA.
3. National Center for PTSD, VA Boston Healthcare System, Boston, Massachusetts, USA.
4. Biomedical Genetics, Boston University, Boston, Massachusetts, USA.
5. Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of University of Southern California, Marina del Rey, California, USA.