1. Rush Medical College Rush University Medical Center Chicago Illinois U.S.A.
2. Department of Otolaryngology University of Minnesota Minneapolis Minnesota U.S.A.
3. Rush Sinus Program, Department of Otorhinolaryngology—Head and Neck Surgery Rush University Medical Center Chicago Illinois U.S.A.
4. Department of Otolaryngology—Head and Neck Surgery University of California Irvine California U.S.A.