[1] Univ Calif Davis, Med Ctr, Dept Otolaryngol Head & Neck Surg, Sacramento, CA 95817 USA
[2] Univ Calif Davis, Med Ctr, Dept Pathol & Lab Med, Sacramento, CA 95817 USA
[3] Univ Calif Davis, Med Ctr, Dept Biomed Engn, Sacramento, CA 95817 USA
[4] NSF Ctr Biophoton Sci & Technol, Sacramento, CA USA
[5] Sunnybrook Hlth Sci Ctr, Toronto, ON M4N 3M5, Canada