1. Laboratory of Polymeric and Composite Materials, University of Mons, 23 Place du Parc, Mons 7000, Belgium
2. Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, 103A Academik G. Bonchev Street, Sofia 1113, Bulgaria
3. Analysis and Characterization Unit, Materia Nova, 1 Avenue Copernic, Mons 7000, Belgium
4. Materials Physics and Optics, University of Mons, 20 Place du Parc, Mons 7000, Belgium
5. BioElectro and Mechanical Systems Department, Free University of Brussels, 50 Avenue F.D. Roosevelt, Brussels 1050, Belgium