1. Division of Rhinology and Endoscopic Skull Base Surgery Mayo Clinic Rochester Minnesota U.S.A.
2. Department of Otolaryngology – Head & Neck Surgery Mayo Clinic Rochester Minnesota U.S.A.
3. Division of Allergic Diseases, Mayo Clinic Rochester Minnesota U.S.A.
4. Department of Otolaryngology – Head & Neck Surgery University of Virginia Charlottesville Virginia U.S.A.