1. Department of Translational Imaging and Department of Nanomedicine; The Methodist Hospital Research Institute; 6560 Fannin St Houston 77030 TX USA
2. Department of Chemistry and the R.E. Smalley Institute for Nanoscale Science and Technology; Rice University; Houston 77251-1892 TX USA
3. Department of Mechanics; Politecnico di Torino; Corso Duca degli Abruzzi 24 Turin 10129 IT
4. Department of Experimental and Clinical Medicine; University of Magna Graecia; Catanzaro 88100 IT
5. Department of Energy; Politecnico di Torino; Corso Duca degli Abruzzi 24 Turin 10129 IT
6. Department of Biosciences; Biotechnology and Pharmacological Sciences; University of Bari; Bari 70126 IT
7. Department of Medicine; Weill Cornell Medical College; 1300 York Avenue New York 10065 NY USA