1. Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, University of Southern California , Marina del Rey, CA, 90089 , USA
2. Goodman-Luskin Microbiome Center, G. Oppenheimer Center for Neurobiology of Stress and Resilience, Vatche and Tamar Manoukian Division of Digestive Diseases, Ingestive Behavior and Obesity Program, David Geffen School of Medicine at UCLA , Los Angeles, CA, 90095 , USA