1. Department of Pharmaceutical Technology, University of Regensburg, Regensburg, Germany.
2. Department of Otorhinolaryngology, University Hospital of Regensburg, Regensburg, Germany.
3. polyMaterials AG, Kaufbeuren, Germany.
4. Faculty of Pharmacy, El-Minia University, El-Minia, Egypt.
5. Department of Otorhinolaryngology, Hospital rechts der Isar, Technical University Munich, Munich, Germany.