1. AutoQuant Imaging, Inc., 877 25th Street, Watervliet, NY 12189, USA
2. Electrical, Computer and Systems Engineering Dept., Rensselaer Polytechnic Institute, Troy, NY 12180, USA
3. Department of Electrical Engineering, State University of New York, Buffalo, NY 14221, USA
4. On Leave at Department of Biological Sciences, National University of Singapore, Singapore