[1] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
[2] Stanford Univ, Dept Ophthalmol, Stanford, CA 94305 USA
[3] Stanford Univ, Otolaryngol, Stanford, CA 94305 USA
[4] Stanford Univ, Hansen Expt Phys Lab, Stanford, CA 94305 USA
[5] Neuronoff Com, Los Angeles, CA USA