[1] Kaiser Permanente, Oakland Med Ctr, Dept Head & Neck Surg, 3600 Broadway,Suite 40, Oakland, CA 94611 USA
[2] Johns Hopkins Univ, Sch Med, Dept Otolaryngol Head & Neck Surg, 6th Floor, Baltimore, MD 21287 USA
[3] Kaiser Permanente, Oakland Med Ctr, Rhinol & Endoscop Skull Base Surg, Dept Head & Neck Surg, Oakland, CA 94611 USA