1. Robert Wood Johnson Foundation Clinical Scholars, University of Michigan, Ann Arbor, Michigan, USA
2. Department of Otolaryngology–Head and Neck Surgery, University of Michigan, Ann Arbor, Michigan, USA
3. HSR&D Service, VA Ann Arbor Healthcare System, Ann Arbor, Michigan, USA
4. Department of Pediatrics and Communicable Diseases, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA
5. Gerald R. Ford School of Public Policy, University of Michigan, Ann Arbor, Michigan, USA