1. Department of Health Behavior and Health Education, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029, USA
2. Center for Spirituality, Theology and Health, Duke University Medical Center, Durham, NC, USA
3. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
4. Department of Medicine, Duke University Medical Center, Durham, NC, USA
5. Neuropsychiatric Imaging Research Laboratory, Duke University Medical Center, Durham, NC, USA