1. National Center for Geriatrics and Welfare Research, National Health Research Institutes , Zhunan, Taiwan
2. Department of Medical Research, China Medical University Hospital, China Medical University , Taichung, Taiwan
3. Department of Psychiatry, National Taiwan University Hospital , Yunlin Branch, Douliu, Taiwan
4. Center for Population Neuroscience and Genetics, Laureate Institute for Brain Research , Tulsa, OK, USA
5. Department of Radiology, School of Medicine, University of California San Diego , La Jolla, CA, USA