[1] Permanente Med Grp Inc, Walnut Creek, CA USA
[2] Univ Kentucky, Med Ctr, Lexington, KY USA
[3] Univ Illinois, Chicago, IL USA
[4] Virginia Mason Med Ctr, Seattle, WA USA
[5] Cleveland Clin, Cleveland, OH USA
[6] Ohio State Univ, Columbus, OH USA
[7] Mississippi Publ Hlth Assoc, Jackson, MS USA
[8] UT Southwestern Med Ctr, Dallas, TX USA
[9] Univ Michigan, Med Sch, Ann Arbor, MI USA
[10] Columbia Univ, Med Ctr, New York, NY USA
[11] AARP, Washington, DC USA
[12] VCU, Sch Med, Richmond, VA USA
[13] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[14] Univ Pittsburgh, Pittsburgh, PA USA
[15] Stanford Univ, Palo Alto, CA USA
[16] Northwestern Med, Chicago, IL USA
[17] Amer Acad Otolaryngol Head & Neck Surg Fdn, Alexandria, VA USA