National Research Council of Italy, Institute of Information Science and Technologies, Via Moruzzi, 1, Pisa, 56124, Italy. claudia.caudai@isti.cnr.it.|National Research Council of Italy, Institute of Information Science and Technologies, Via Moruzzi, 1, Pisa, 56124, Italy. emanuele.salerno@isti.cnr.it.|National Research Council of Italy, Institute of Clinical Physiology, Via Moruzzi, 1, 56124, Pisa, Italy. mzoppe@ifc.cnr.it.|National Research Council of Italy, Institute of Information Science and Technologies, Via Moruzzi, 1, Pisa, 56124, Italy. anna.tonazzini@isti.cnr.it.