1. Department of Biotechnology, Lund University, Getingevagen 60, P.O. Box 124, S-221 00, Lund, Sweden
2. Department of Materials Science and Technology, University of Crete and IESL-FORTH, Heraklion, Greece
3. Department of Micro and Nanotechnology, Technical University of Denmark, Building 345east, 2800 Lyngby, Denmark