1. Department of Pathology Ludwig Maximilian University of Munich Munich Germany
2. Department of Surgery, Beth Israel Deaconess Medical Center Harvard Medical School Boston Massachusetts U.S.A.
3. Department of Ophthalmology Technical University of Munich Munich Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery Ludwig Maximilian University of Munich Munich Germany
5. ENT‐Center Dr. Lübbers & Kollegen Weilheim Germany