1. Texas Allergy and Sinus Center; Cypress TX
2. Department of Otorhinolaryngology-Head and Neck Surgery; University of Texas McGovern Medical School at Houston; Houston TX
3. Tan Tock Seng Hospital, National University Singapore; Singapore
4. Department of Otolaryngology; University of North Carolina School of Medicine; Chapel Hill NC
5. Department of Otolaryngology; Pontificia Universidad Católica de Chile; Santiago Chile
6. Department of Otolaryngology; Division of Cranio Maxillo-Facial Surgery; Military Institute of Medicine Warsaw Poland