1. School of Chemical Sciences and National Institute for Cellular Biotechnology Dublin City University Glasnevin, Dublin 9 Ireland
2. Department of Physics, Chemistry and Pharmacy University of Southern Denmark Campusvej 55 5230 Odense M Denmark
3. Department of Chemistry Ludwig-Maximilians-Universität Butenandtstrasse 5–13 81377 Munich Germany
4. CÚRAM, Centre for Research in Medical Devices Dublin City University Glasnevin, Dublin 9 Ireland