1. Department of Otorhinolaryngology, Head and Neck Surgery, Saarland University Medical Center, Homburg (Saar), Germany
2. Institute of Medical Biochemistry and Molecular Biology, Saarland University Medical Center, Homburg (Saar), Germany
3. Department of General and Surgical Pathology, Saarland University Medical Center, Homburg (Saar), Germany
4. Institute of Virology, Saarland University Medical Center, Homburg (Saar), Germany