1. Nobil Bio Ricerche; Via Valcastellana 26 Portacomaro (AT) 14037 Italy
2. University of Oulu; Department of Anatomy and Cell Biology; PO Box 5000 Oulu 90014 Finland
3. University of Trento; Department of Materials Engineering and Industrial Technologies; Trento Italy
4. European Commission Joint Research Center; Institute for Health and Consumer Protection; Ispra Italy