1. Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California, USA.
2. Medical Imaging Business Center, Ricoh Company Ltd., Kanazawa, Japan.
3. Memory and Aging Center, Department of Neurology, University of California, San Francisco, San Francisco, California, USA.
4. Epilepsy Center, Department of Neurology, University of California, San Francisco, San Francisco, California, USA.