1. Stratingh
Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
2. Electron
Microscopy, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 9747 AG Groningen, The Netherlands
3. CNR-ITAE “Nicola Giordano”, Via S. Lucia Sopra Contesse, 5, 98126 Messina, Italy