[1] Massachusetts Eye & Ear, Dept Otolaryngol, 243 Charles St, Boston, MA 02114 USA
[2] Yale Univ, Sch Med, Dept Internal Med, Sect Cardiovasc Med, New Haven, CT 06510 USA
[3] Yale Univ, Dept Hlth Policy & Management, Sch Publ Hlth, New Haven, CT USA
[4] Yale New Haven Med Ctr, Ctr Outcomes Res & Evaluat, 20 York St, New Haven, CT 06504 USA
[5] Univ Colorado, Div Cardiol, Anschutz Med Campus, Aurora, CO USA
[6] Colorado Cardiovasc Outcomes Res Consortium, Denver, CO USA
[7] Yale Univ, Sch Med, Dept Internal Med, Sect Gen Internal Med, New Haven, CT 06510 USA