1. University of Washington, Human Photonics Laboratory, Department of Bioengineering, 204 Fluke Hall, Seattle, Washington 98195
2. Cornell University, Vision & Image Analysis Group, School of Electrical and Computer Engineering, 392 Rhodes Hall, Ithaca, New York 14850
3. VisionGate Inc., 275 N. Gateway Drive, Phoenix, Arizona 85034
4. University of Washington, Human Photonics Laboratory, Department of Mechanical Engineering, P.O. Box 352600, Seattle, Washington 98195