1. From the Department of Otology and Laryngology, Harvard Medical School, and the Division of Laryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
2. Department of Otolaryngology, University of Miami School of Medicine, Miami, Florida
3. Department of Otolaryngology–Head & Neck Surgery, Henry Ford Health Systems, Detroit and Ann Arbor
4. Department of Otolaryngology, University of Michigan Medical School, Division of Vocal Arts–University of Michigan School of Music, and University of Michigan Vocal Health Center, Michigan
5. Department of Otolaryngology, Wake Forest University School of Medicine, and Center for Voice Disorders of Wake Forest University, Winston-Salem, North Carolina
6. Department of Otolaryngology, University of Pittsburgh School of Medicine, and University of Pittsburgh Voice Center, Pittsburgh, Pennsylvania