1. Department of Otolaryngology, Children’s National Medical Center, George Washington University School of Medicine and Health Sciences, Washington, DC
2. Department of Otolaryngology–Head and Neck Surgery, London Health Sciences Centre and Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
3. Department of Obstetrics and Gynecology, Virginia Hospital Center, Arlington, Virginia
4. Department of Otolaryngology–Head and Neck Surgery, Boston Medical Center, Chobanian and Avedisian School of Medicine at Boston University, Boston, Massachusetts