[1] Johns Hopkins Sch Med, Dept Anesthesiol & Crit Care Med, Baltimore, MD 21287 USA
[2] Johns Hopkins Sch Med, Med Scientist Training Program, Baltimore, MD 21287 USA
[3] Johns Hopkins Univ Hosp, Legal Dept, Baltimore, MD 21287 USA
[4] Johns Hopkins Sch Med, Otolaryngol Head & Neck Surg, Baltimore, MD 21287 USA
[5] Johns Hopkins Sch Med, Surg, Baltimore, MD 21287 USA
[6] Johns Hopkins Sch Med, Med, Baltimore, MD 21287 USA
[7] Johns Hopkins Sch Med, MD Program, Baltimore, MD 21287 USA
[8] Univ Maryland, Sch Med, MD Program, Baltimore, MD 21201 USA
[9] Johns Hopkins Med, Armstrong Inst Patient Safety & Qual, Baltimore, MD USA
[10] Oregon Hlth & Sci Univ, Otolaryngol Head & Neck Surg, Portland, OR 97201 USA