1. Dept. of Elec., Comput. and Biomedical Eng., Univ. of Pavia, Via Ferrata 5, Pavia 27100, Italy,
2. Dept. of Elec. and Comput. Eng., Johns Hopkins Univ., Baltimore, MD
3. Dept. of Biomedical Eng., Johns Hopkins Univ., Baltimore, MD
4. Dept. of Cardiovascular Imaging and Dynam., KU Leuven, Leuven, Belgium