1. Magnetic Resonance Center (CERM), University of Florence, 50019 Sesto Fiorentino, Florence, Italy
2. DICUS, Department of Chemistry, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
3. Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy