1. Institute of PolymersBulgarian Academy of Sciences Sofia Bulgaria
2. Department of Material Science and Technology, University ‘Prof. Assen Zlatarov’ Burgas Bulgaria
3. Department of Pharmacology, Pharmacotherapy and ToxicologyMedical University of Sofia, Faculty of Pharmacy Sofia Bulgaria
4. Department of Pharmaceutical Technology and BiopharmaceuticsMedical University of Sofia, Faculty of Pharmacy Sofia Bulgaria