1. Fondazione CNR/Regione
Toscana G. Monasterio, Pisa, I-56124, Italy
2. Institute
of Life Sciences, Scuola Superiore Sant’Anna, Pisa, I-56127, Italy
3. Department
of Physics, University of Pisa, Pisa, I-56127, Italy
4. Department
of Electrical Engineering, Technical University of Denmark, KongensLyngby, DK-2800, Denmark
5. GE Healthcare, Broendby, DK-2605, Denmark
6. Institute
of Clinical Physiology, National Council of Research, Pisa, I-56124, Italy