1. Brain Research Imaging Center and Department of Radiology; University of Chicago; Chicago Illinois USA
2. National Institute on Drug Abuse; National Institutes of Health; Baltimore Maryland USA
3. Department of Neurobiology; University of Chicago; Chicago Illinois USA
4. State Key Lab for Brain Research; University of Hong Kong; Hong Kong China
5. Center for MRI Research; Beijing City Key Lab for Medical Physics and Engineering; McGovern Institute for Brain Research; Peking University; Beijing China