1. Signal & Image Processing Institute, University of Southern California, Los Angeles, CA 90089, USA
2. MEG Program, Departments of Neurology & Biophysics, Froedtert & Medical College of Wisconsin, Milwaukee, WI 53226, USA
3. Epilepsy Center, Cleveland Clinic Neurological Institute, Cleveland, OH 44195, USA
4. MEG Lab, McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA