[1] Stanford Univ, Dept Otolaryngol Head & Neck Surg, Div Sleep Surg, Stanford, CA 94305 USA
[2] China Med Univ Hosp, Dept Otolaryngol, Taichung, Taiwan
[3] Stanford Univ, Dept Anesthesiol, Stanford, CA 94305 USA
[4] Tripler Army Med Ctr, Div Sleep Surg & Med, Dept Otolaryngol, Oahu, HI USA
[5] Stanford Univ, Dept Otolaryngol, Div Sleep Med, Redwood City, CA USA