1. RIKEN Advanced Science Institute, Saitama, Japan
2. Hitachi High-Technologies, Ibaraki, Japan
3. RIKEN Brain Science Institute, Saitama Japan
4. RIKEN Spring-8 Center, Hyogo, Japan
5. Japan Science and Technology Agency, Saitama, Japan
6. Gunma University, Gunma, Japan
7. INSERM U870, INSA-Lyon, Villeurbanne, France