1 Institute of Pathology, Rostock University Medical Center, 18057 Rostock, Germany.
2 Department of Otorhinolaryngology, Head and Neck Surgery "Otto Koerner", Rostock University Medical Center, 18057 Rostock, Germany.
3 Department of Internal Medicine B, Cardiology, University Medicine Greifswald, 17475 Greifswald, Germany.
4 Institute of Pathology, University of Luebeck, University Hospital Schleswig-Holstein, Campus Luebeck, 23538 Luebeck, Germany.
5 Department of Oto-Rhino-Laryngology & Head and Neck Surgery, University of Lubeck, University Hospital Schleswig-Holstein, Campus Luebeck, 23538 Luebeck, Germany.
6 Department of Internal Medicine, Medical Clinic III-Hematology, Oncology, Palliative Medicine, Rostock University Medical Center, 18057 Rostock, Germany.