1. Laboratory of Pharmaceutical Technology, Department of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki, Greece;
2. Department of Materials Science, University of Patras, Patras, Greece;
3. Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, Patras, Greece;
4. Center for Biomedical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA