1. Department of Electrical and Computer Engineering, University of California, Santa Cruz, Santa Cruz, CA, USA
2. Department of Electrical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong
3. IBM Research - Zurich, Zurich, Switzerland
4. Institute of Neuroinformatics University of Zurich and ETH Zurich, Zurich, Switzerland
5. Department of Electrical Engineering, Yale University, New Haven, CT, USA